PROCESS FOR DYEING KERATIN FIBRES USING AT LEAST ONE PARTICULAR TRIARYLMETHANE DYE AND AT LEAST ONE FLUORESCENT DYE

Abstract

The present invention relates to a process for dyeing keratin fibres, in particular human keratin fibres such as the hair, using one or more particular triarylmethane dyes and one or more fluorescent dyes.

The present invention also relates to a cosmetic composition comprising the dyes defined above, and also to a multi-compartment device containing said dyes.

The present invention also relates to the use of said dyes for dyeing light keratin fibres, especially human keratin fibres such as the hair, in chestnut-brown, dark chestnut-brown, brown, brown with a glint, or even black, without using an additional dye other than those defined above.

Claims

1. Process for dyeing keratin fibres, in particular human keratin fibres such as the hair, comprising the application to said keratin fibres of the following ingredients: (a) one or more triarylmethane dyes chosen from the compounds of formula (I) below, the optical isomers thereof, the geometrical isomers thereof, the tautomers thereof, the organic or mineral, acid or base salts thereof, the solvates thereof such as hydrates, and mixtures thereof, ##STR00055## in which formula (I): R.sub.1, R.sub.2, R.sub.1 and R.sub.2, which may be identical or different, represent: a hydrogen atom, a linear or branched C.sub.1 to C.sub.20 alkyl radical; that is optionally substituted and/or optionally interrupted with one or more heteroatoms, preferably oxygen or sulfur, and/or with one or more groups comprising at least one heteroatom, preferably chosen from oxygen, sulfur, C(O), SO, SO.sub.2 and SO.sub.3.sup., or combinations thereof, or a benzyl radical optionally substituted with one or more SO.sub.3.sup. or SO.sub.3H groups; R.sub.3 and R.sub.3, which may be identical or different, represent, independently of each other: a linear or branched C.sub.1 to C.sub.6 alkyl radical; a sulfonate group SO.sub.3.sup., or a sulfonic group SO.sub.3H; n and m, which may be identical or different, represent two integers ranging from 0 to 4; the radicals R.sub.4, which may be identical or different, represent, independently of each other: a linear or branched C.sub.1 to C.sub.6 alkyl radical; a hydroxyl radical, a group SO.sub.3.sup., a group SO.sub.3H, a halogen atom, preferably a chlorine atom, or alternatively two adjacent radicals R.sub.4 together form an unsaturated 6-membered ring, preferably an aromatic ring such as benzo, optionally substituted with one or more SO.sub.3.sup. or SO.sub.3H groups; q is an integer ranging from 0 to 4; R.sub.5 represents: a hydrogen atom, a halogen atom, preferably a chlorine atom, an amino radical, a hydroxyl radical, an electron-withdrawing group SO.sub.3.sup. or SO.sub.3H, or a radical NR.sub.6R.sub.7, in which R.sub.6 and R.sub.7, which may be identical or different, represent, independently of each other: a hydrogen atom, or a linear or branched C.sub.1 to C.sub.6 alkyl radical; it being understood that: the radical R.sub.2 is present or absent, symbolized by the dashed bond, when R.sub.2 is present, then the nitrogen atom that bears it is in cationic ammonium form, when R.sub.2 is absent, then the nitrogen atom that bears it is not charged, (+) is not present, and the compound of formula (I) optionally comprises one or more anions An.sup. and optionally one or more cations M to ensure the electrical neutrality of the molecule; with: An.sup. representing an anion, preferably chosen from bromide, chloride, methylsulfate and toluenesulfonate ions or a mixture of these ions; and M.sup.+ representing a cation, preferably chosen from sodium, potassium, magnesium, calcium, zinc and ammonium ions or a mixture of these ions; and (b) one or more fluorescent dyes; said fluorescent dyes being direct dyes chosen from cyanin dyes, styryl/hemicyanin dyes, naphthalimide dyes, and mixtures thereof; it being understood that the triarylmethane dye(s) (a) and the fluorescent dye(s) (b) are applied to said keratin fibres together or sequentially.

2. Process according to claim 1, characterized in that n and m, which may be identical or different, represent two integers ranging from 0 to 2.

3. Process according to claim 1, characterized in that R.sub.1, R.sub.2, R.sub.1 and R.sub.2, which may be identical or different, represent, independently of each other: 290 a hydrogen atom, a linear or branched C.sub.1 to C.sub.6 alkyl radical, which is optionally substituted, and/or optionally interrupted with one or more heteroatoms chosen from oxygen and sulfur, and/or with one or more groups comprising at least one heteroatom, preferably chosen from oxygen, sulfur, C(O), SO, SO.sub.2 and SO.sub.3.sup., or combinations thereof, preferably an unsubstituted linear or branched C.sub.1 to C.sub.6 alkyl radical, and more preferentially an unsubstituted linear or branched C.sub.1 to C.sub.4 alkyl radical, or a benzyl radical substituted with an SO.sub.3.sup. group.

4. Process according to claim 1, characterized in that R.sub.5 represents: a hydrogen atom, an SO.sub.3.sup. group, or a radical NR.sub.6R.sub.7, with R.sub.6 and R.sub.7, which may be identical or different, representing, independently of each other, a hydrogen atom or a linear or branched C.sub.1 to C.sub.6 alkyl radical, and preferably a C.sub.1 to C.sub.4 alkyl radical, such as a methyl or ethyl radical.

5. Process according to claim 1, characterized in that the triarylmethane dye(s) are cationic and are chosen from the compounds of formula (I-cat) below: ##STR00056## in which formula (I-cat): R.sub.1, R.sub.2, R.sub.1 and R.sub.2, which may be identical or different, represent: a hydrogen atom, a linear or branched C.sub.1 to C.sub.20 alkyl radical: that is optionally substituted and/or optionally interrupted with one or more heteroatoms, preferably oxygen or sulfur, and/or with one or more groups comprising at least one heteroatom, preferably chosen from oxygen, sulfur, C(O), SO, SO.sub.2 and SO.sub.3.sup., or combinations thereof, or a benzyl radical optionally substituted with one or more SO.sub.3.sup. or SO.sub.3H groups: R.sub.3 and R.sub.3, which may be identical or different, represent, independently of each other: a linear or branched C.sub.1 to C.sub.6 alkyl radical: a sulfonate group SO.sub.3.sup., or a sulfonic group SO.sub.3H: n and m, which may be identical or different, represent two integers ranging from 0 to 4; the radicals R.sub.4, which may be identical or different, represent, independently of each other: a linear or branched C.sub.1 to C.sub.6 alkyl radical: a hydroxyl radical, a group SO.sub.3.sup.; a group SO.sub.3H, a halogen atom, preferably a chlorine atom, or alternatively two adjacent radicals R.sub.4 together form an unsaturated 6-membered ring, preferably an aromatic ring such as benzo, optionally substituted with one or more SO.sub.3.sup. or SO.sub.3H groups: q is an integer ranging from 0 to 4: R.sub.5 represents: a hydrogen atom, a halogen atom, preferably a chlorine atom, an amino radical, a hydroxyl radical, an electron-withdrawing group SO.sub.3.sup. or SO.sub.3H, or a radical NR.sub.6R.sub.7, in which R.sub.6 and R.sub.7, which may be identical or different, represent, independently of each other: a hydrogen atom, or a linear or branched C.sub.1 to C.sub.6 alkyl radical: it being understood that: the radical R.sub.2 is present or absent, symbolized by the dashed bond, when R.sub.2 is present, then the nitrogen atom that bears it is in cationic ammonium form, when R.sub.2 is absent, then the nitrogen atom that bears it is not charged, (+) is not present, and it being understood that (I-cat) does not comprise more than one sulfonate group.

6. Process according claim 1, characterized in that the triarylmethane dye(s) are anionic and are chosen from the compounds of formula (I-an) or (I-an) below: ##STR00057## in which formula (I-an) or (I-an): R.sub.1, R.sub.2, R.sub.1 and R.sub.2, which may be identical or different, represent: a hydrogen atom, a linear or branched C.sub.1 to C.sub.20 alkyl radical: that is optionally substituted and/or optionally interrupted with one or more heteroatoms, preferably oxygen or sulfur, and/or with one or more groups comprising at least one heteroatom, preferably chosen from oxygen, sulfur, C(O), SO, SO.sub.2, and SO.sub.3.sup., or combinations thereof, or a benzyl radical optionally substituted with one or more SO.sub.3.sup. or SO.sub.3H groups: R.sub.3 and R.sub.3, which may be identical or different, represent, independently of each other: a linear or branched C.sub.1 to C.sub.6 alkyl radical: a sulfonate group SO.sub.3.sup., or a sulfonic group SO.sub.3H: n and m, which may be identical or different, represent two integers ranging from 0 to 4: the radicals R.sub.4, which may be identical or different, represent, independently of each other: a linear or branched C.sub.1 to C.sub.6 alkyl radical: a hydroxyl radical, a group SO.sub.3.sup., a group SO.sub.3H, a halogen atom, preferably a chlorine atom, or alternatively two adjacent radicals R.sub.4 together form an unsaturated 6-membered ring, preferably an aromatic ring such as benzo, optionally substituted with one or more SO.sub.3.sup. or SO.sub.3H groups: q is an integer ranging from 0 to 4: R.sub.5 represents: a hydrogen atom, a halogen atom, preferably a chlorine atom, an amino radical, a hydroxyl radical, an electron-withdrawing group SO.sub.3.sup. or SO.sub.3H, or a radical NR.sub.6R.sub.7, in which R.sub.6 and R.sub.7, which may be identical or different, represent, independently of each other: a hydrogen atom, or a linear or branched C.sub.1 to C.sub.6 alkyl radical: it being understood that: the radical R.sub.2 is present or absent, symbolized by the dashed bond, when R.sub.2 is present, then the nitrogen atom that bears it is in cationic ammonium form, when R.sub.2 is absent, then the nitrogen atom that bears it is not charged, (+) is not present, and it being understood that: (I-an) comprises at least two sulfonate groups on ring A, B or C, (I-an) comprises at least one sulfonate group on ring A, B or C, and one or more cation(s) M.sup.+ are present to compensate for the anionic charge(s) of the sulfonate group(s), wherein M.sup.+ is chosen from sodium, potassium, magnesium, calcium, zinc, and ammonium ions, or a mixture of these ions.

7. Process according to any one of claim 1, characterized in that the triarylmethane dye(s) are nonionic and are chosen from the compounds of formula (I-nion) below: ##STR00058## in which formula (I-nion): R.sub.1, R.sub.2, R.sub.1 and R.sub.2, which may be identical or different, represent: a hydrogen atom, a linear or branched C.sub.1 to C.sub.20 alkyl radical: that is optionally substituted and/or optionally interrupted with one or more heteroatoms, preferably oxygen or sulfur, and/or with one or more groups comprising at least one heteroatom, preferably chosen from oxygen, sulfur, C(O), SO, SO.sub.2 and SO.sub.3.sup., or combinations thereof, or a benzyl radical optionally substituted with one or more SO.sub.3.sup. or SO.sub.3H groups: R.sub.3 and R.sub.3, which may be identical or different, represent, independently of each other: a linear or branched C.sub.1 to C.sub.6 alkyl radical: a sulfonate group SO.sub.3.sup., or a sulfonic group SO.sub.3H: n and m, which may be identical or different, represent two integers ranging from 0 to 4: the radicals R.sub.4, which may be identical or different, represent, independently of each other: a linear or branched C.sub.1 to C.sub.6 alkyl radical: a hydroxyl radical, a group SO.sub.3.sup., a group SO.sub.3H, a halogen atom, preferably a chlorine atom, or alternatively two adjacent radicals RP together form an unsaturated 6-membered ring, preferably an aromatic ring such as benzo, optionally substituted with one or more SO.sub.3.sup. or SO.sub.3H groups: q is an integer ranging from 0 to 4: R.sub.5 represents: a hydrogen atom, a halogen atom, preferably a chlorine atom, an amino radical, a hydroxyl radical, an electron-withdrawing group SO.sub.3.sup. or SO.sub.3H, or a radical NR.sub.6R.sub.7, in which R.sub.6 and R.sub.7, which may be identical or different represent, independently of each other: a hydrogen atom, or a linear or branched C.sub.1 to C.sub.6 alkyl radical: it being understood that: the radical R.sub.2 is present or absent, symbolized by the dashed bond, when R.sub.2 is present, then the nitrogen atom that bears it is in cationic ammonium form, when R.sub.2 is absent, then the nitrogen atom that bears it is not charged, (+) is not present, and it being understood that (I-nion) does not comprise any sulfonate groups on ring A, B or C.

8. Process according to claim 1, characterized in that the triarylmethane dye(s) (a) are chosen from the following compounds, the optical isomers thereof, the geometrical isomers thereof, the tautomers thereof, the organic or mineral, acid or base salts thereof, the solvates thereof such as hydrates, and mixtures thereof: ##STR00059## ##STR00060## ##STR00061## ##STR00062##

9. Process according to claim 1, characterized in that the fluorescent dye(s) (b) are direct and cationic and are chosen from styryl or hemicyanin cationic dyes.

10. Process according to claim 1, characterized in that the fluorescent dye(s) (b) are dyes which absorb light in the yellow, orange and red range, preferably in the absorption wavelength .sub.abs between 400 nm and 500 nm inclusive.

11. Process according to claim 1, characterized in that the fluorescent dye(s) (b) are dyes which bear at least one cationic chromophore chosen from formulae (III), (IV), (IIIa) and (IVa) below:
W.sup.+[C(R.sup.c)C(R.sup.d)].sub.mAr-(*)Q.sup.(III)
Ar[C(R.sup.d)C(R.sup.c)].sub.mW.sup.+-(*)Q.sup.(IV), in which formulae (III) and (IV): W.sup.+ represents a cationic heteroaryl group, in particular comprising a quaternary ammonium optionally substituted with one or more (C.sub.1-C.sub.8)alkyl groups optionally substituted in particular with one or more hydroxyl groups; W.sup.+ represents a divalent heteroaryl radical as defined for W.sup.+; Ar represents an aryl group such as phenyl or naphthyl, optionally substituted preferably with i) one or more halogen atoms such as chlorine or fluorine; ii) one or more (C.sub.1-C.sub.8)alkyl and preferably C.sub.1-C.sub.4 alkyl groups such as methyl; iii) one or more hydroxyl groups; iv) one or more (C.sub.1-C.sub.8)alkoxy groups such as methoxy; v) one or more hydroxy(C.sub.1-C.sub.8)alkyl groups such as hydroxyethyl, vi) one or more amino or (di)(C.sub.1-C.sub.8)alkylamino groups, preferably with the C.sub.1-C.sub.4 alkyl part optionally substituted with one or more hydroxyl groups, such as (di)hydroxyethylamino, vii) with one or more acylamino groups; viii) one or more heterocycloalkyl groups such as piperazinyl, piperidyl or 5- or 6-membered heteroaryl such as pyrrolidinyl, pyridyl and imidazolinyl; Ar is a divalent aryl radical as defined for Ar; m represents an integer between 1 and 4 inclusive, in particular, m is 1 or 2; better still 1; R.sup.c and R.sup.d, which may be identical or different, represent a hydrogen atom or optionally a substituted (C.sub.1-C.sub.8)alkyl and preferably C.sub.1-C.sub.4 alkyl group, or alternatively R.sup.c is contiguous with W or W.sup.+ and/or R.sup.d is contiguous with Ar or Ar and form, with the atoms that bear them, a (hetero)cycloalkyl; in particular, R.sup.c is contiguous with W.sup.+ or W.sup.+ and forms a (hetero)cycloalkyl such as cyclohexyl; Q.sup. is an organic or mineral anionic counterion; (*) represents the part of the fluorescent chromophore that is bonded to the rest of the dye; preferably, W.sup.+ or W.sup.+ is an imidazolium, pyridinium, benzimidazolium, pyrazolium, benzothiazolium or quinolinium radical optionally substituted with one or more identical or different C.sub.1-C.sub.4 alkyl radicals; preferably, the fluorescent chromophore(s) are chosen from those with m=1, Ar representing a phenyl group substituted para to the styryl group C(R.sup.d)C(R.sup.c) with a (di)(hydroxy)(C.sub.1-C.sub.6)(alkyl)amino group such as dihydroxy(C.sub.1-C.sub.4)alkylamino, and W.sup.+ representing an imidazolium or pyridinium group, preferably ortho- or para-pyridinium; ##STR00063## where represents the bond with the dye in which formulae (IIIa) and (IVa) R.sup.e, R.sup.f, R.sup.g and R.sup.h, which may be identical or different, represent a hydrogen atom or a (C.sub.1-C.sub.6)alkyl group which is optionally substituted, preferentially with a di(C.sub.1-C.sub.6)alkylamino or tri(C.sub.1-C.sub.6)alkylammonium group such as trimethylammonium.

12. Process according to claim 1, characterized in that the fluorescent dye(s) (b) are chosen from the dyes of formulae (V), (VI) and (VII) and also the organic or mineral acid or base salts thereof, the optical isomers, geometrical isomers and tautomers thereof, and the solvates thereof such as hydrates: ##STR00064## in which formulae (V), (VI) and (VII): R.sub.1 and R.sub.2, which may be identical or different, represent a hydrogen atom or a C.sub.1-C.sub.6 alkyl group; preferentially a hydrogen atom; G.sub.1 represents a hydrogen atom or a group chosen from NH.sub.2 and OH; R.sub.a, R.sub.a, R.sub.a, R.sub.a, R.sub.b, R.sub.b, R.sub.b and R.sub.b, which may be identical or different, represent a) a hydrogen atom, b) a halogen atom, a group from among: c) amino, d) (C.sub.1-C.sub.4)alkylamino, e) (C.sub.1-C.sub.4)dialkylamino, f) cyano, g) carboxyl C(O)OH or carboxylate C(O)O.sup., Q.sup.+, h) hydroxyl OH or alkoxide O.sup.Q.sup.+, i) (poly)halo(C.sub.1-C.sub.6)alkyl such as trifluoromethyl, j) acylamino, k) (C.sub.1-C.sub.6)alkoxy, l) (C.sub.1-C.sub.6)alkylthio, m) (poly)hydroxy(C.sub.2-C.sub.4)alkoxy, n) (C.sub.1-C.sub.6)alkylcarbonyloxy, o) (C.sub.1-C.sub.6)alkoxycarbonyl, p) (C.sub.1-C.sub.6)alkylcarbonylamino, q) acylamino, r) carbamoyl, s) (C.sub.1-C.sub.6)alkylsulfonylamino, t) aminosulfonyl, u) SO.sub.3H or sulfonate SO.sub.3.sup., Q.sup.+ or v) (C.sub.1-C.sub.6)alkyl optionally substituted with a group chosen from (C.sub.1-C.sub.6)alkoxy, hydroxyl, cyano, carboxyl, amino, (di)(C.sub.1-C.sub.4)alkylamino, or alternatively the two alkyl radicals borne by the nitrogen atom of the amino group form a 5- to 7-membered heterocycle optionally comprising another nitrogen or non-nitrogen heteroatom; in particular, R.sub.a, R.sub.a, R.sub.a, R41 .sub.a, R.sub.b, R.sub.b, R.sub.b and R41 .sub.b represent a hydrogen or halogen atom or a (C.sub.1-C.sub.4)alkyl group, preferably a hydrogen atom; or alternatively two groups R.sub.a and R.sub.a; R.sub.b and R.sub.b borne by two adjacent carbon atoms together form a benzo or indeno ring, a fused heterocycloalkyl or fused heteroaryl group; the benzo, indeno, heterocycloalkyl or heteroaryl ring being optionally substituted with a halogen atom, an amino, (C.sub.1-C.sub.4)alkylamino, (C.sub.1-C.sub.4)dialkylamino, nitro, cyano, carboxyl, hydroxyl or trifluoromethyl group, an acylamino, (C.sub.1-C.sub.4)alkoxy (poly)hydroxy(C.sub.1-C.sub.4)alkoxy, (C.sub.1-C.sub.4)alkylcarbonyloxy, (C.sub.1-C.sub.4)alkoxycarbonyl or (C.sub.1-C.sub.4)alkylcarbonylamino radical, an acylamino, carbamoyl or alkoxyalkylsulfonylamino radical, an aminosulfonyl radical, or a (C.sub.1-C.sub.6)alkyl radical optionally substituted with: a group chosen from (C.sub.1-C.sub.6)alkoxy, hydroxyl, cyano, carboxyl, amino, (C.sub.1-C.sub.4)alkylamino and (C.sub.1-C.sub.4)dialkylamino, or alternatively the two alkyl radicals borne by the nitrogen atom of the amino group form a 5- to 7-membered heterocycle optionally comprising another nitrogen or non-nitrogen heteroatom; preferentially, R.sub.a and R.sub.a together form a benzo group; or alternatively, two groups R.sub.i and R.sub.a; and/or a group R.sub.i and R.sub.a together form a fused (hetero)cycloalkyl, preferentially cycloalkyl such as cyclohexyl; R.sub.g represents a hydrogen atom, a (hetero)aryl(C.sub.1-C.sub.4)alkyl group or a (C.sub.1-C.sub.6)alkyl group that is optionally substituted; preferentially, R.sub.b represents a hydrogen atom or a (C.sub.1-C.sub.3)alkyl or benzyl group; R.sub.e represents a covalent bond, a linear or branched, optionally substituted (C.sub.1-C.sub.8)alkylene or (C.sub.2-C.sub.8)alkenylene hydrocarbon-based chain, preferably R.sub.e represents an unsubstituted (C.sub.1-C.sub.6)alkylene; R.sub.f represents a hydrogen atom, a (C.sub.1-C.sub.4)alkoxy group, an amino group R.sub.3R.sub.4N, a quaternary ammonium group M, R.sub.3R.sub.4R.sub.5N.sup.+ in which R.sub.3, R.sub.4 and R.sub.5, which may be identical or different, represent a (C.sub.1-C.sub.4)alkyl group or R.sub.3R.sub.4N represents an optionally substituted heteroaryl group, preferentially an optionally substituted imidazolyl group, or alternatively M, R.sub.3R.sub.4R.sub.5N.sup.+ represents an optionally substituted cationic heteroaryl group, preferentially an imidazolinium group optionally substituted with a (C.sub.1-C.sub.3)alkyl group; G represents i) a group NR.sub.cR.sub.d, ii) OR with R representing a) a hydrogen atom, b) an optionally substituted, preferentially unsubstituted (C.sub.1-C.sub.6)alkyl group, c) an optionally substituted (hetero)aryl group, d) an optionally substituted (hetero)aryl(C.sub.1-C.sub.6)alkyl group such as benzyl, e) optionally substituted (hetero)cycloalkyl, f) optionally substituted (hetero)cycloalkyl(C.sub.1-C.sub.6)alkyl; according to a particular embodiment, G represents a group NR.sub.cR.sub.d, according to another particular embodiment, G represents a (C.sub.1-C.sub.6)alkoxy group; or alternatively when G represents NR.sub.cR.sub.d, two groups R.sub.c and R.sub.a and/or R.sub.d and R.sub.a together form a saturated heteroaryl or heterocycle, optionally substituted with one or more (C.sub.1-C.sub.6)alkyl groups, preferentially a 5- to 7-membered heterocycle containing one or two heteroatoms chosen from nitrogen and oxygen; more preferentially, the heterocycle is chosen from morpholinyl, piperazinyl, piperidyl and pyrrolidinyl groups; R.sub.c and R.sub.d, which may be identical or different, represent a hydrogen atom or a group from among: a) optionally substituted (hetero)aryl such as phenyl, b) optionally substituted (hetero)aryl(C.sub.1-C.sub.4)alkyl, c) optionally substituted (hetero)cycloalkyl, d) optionally substituted (hetero)cycloalkyl(C.sub.1-C.sub.4)alkyl, f) (C.sub.2-C.sub.8)alkyl or g) (C.sub.1-C.sub.8)alkyl which is optionally substituted, preferably optionally substituted with a hydroxyl, carboxyl, carboxylate, sulfate or sulfonate group; or alternatively two adjacent radicals R.sub.c and R.sub.d borne by the same nitrogen atom together form an optionally substituted heterocyclic or optionally substituted heteroaryl group; R.sub.i and R.sub.i, which may be identical or different, represent a hydrogen atom or a (C.sub.1-C.sub.4)alkyl group; ##STR00065## represents a (hetero)aryl group fused to the phenyl ring; or alternatively is absent from the phenyl; preferentially, when the ring is present, the ring is a benzo; m represents an integer between 1 and 18 inclusive, particularly an integer between 1 and 14 inclusive; preferentially an integer between 2 and 10 inclusive; more preferentially an integer between 3 and 8; more particularly an integer between 4 and 6; M represents an anionic counterion, derived from a salt of an organic or mineral acid, or from an organic or mineral base that ensures the electrical neutrality of the dye; Q.sup.+ represents a cationic counterion, derived from a salt of an organic or mineral acid, or from an organic or mineral base that ensures the electrical neutrality of the dye such as alkali metal, alkaline-earth metal or ammonium; it being understood that when the dye comprises a carboxylate, sulfonate or alkoxide group, then M and Q.sup.+ may be absent to ensure the electrical neutrality of said dye.

13. Process according to claim 1, characterized in that the fluorescent dye(s) (b) are chosen from the styryl dyes of formula (VIII) below, and also the organic or mineral acid or base salts thereof, the optical isomers, geometrical isomers and tautomers thereof, and the solvates thereof such as hydrates: ##STR00066## in which formula (VIII) R.sub.1 and R.sub.2, which may be identical or different, represent a hydrogen atom; R.sub.i and R.sub.i, which may be identical or different, represent a hydrogen atom or a (C.sub.1-C.sub.4)alkyl group, preferably hydrogen; R.sub.a, R.sub.a and R.sub.a, which may be identical or different, represent a hydrogen atom, a halogen atom such as fluorine, or an OH, O.sup.Q.sup.+, (C.sub.1-C.sub.6)alkoxy, nitro, or cyano group, with Q.sup.+ representing a cationic counterion, derived from a salt of an organic or mineral acid, or from an organic or mineral base that ensures the electrical neutrality of the dye such as alkali metal, alkaline-earth metal or ammonium; R.sub.b, R.sub.b and R.sub.b, which may be identical or different, represent a hydrogen atom or a (C.sub.1-C.sub.6)alkyl group; or alternatively two contiguous radicals R.sub.b and R.sub.b form, together with the carbon atoms that bear them, a benzo group that is condensed or fused to the pyridinium group, said benzo group possibly being substituted; preferably, said benzo group is unsubstituted; G represents a group NR.sub.cR.sub.d or (C.sub.1-C.sub.6)alkoxy group which is optionally substituted, preferentially unsubstituted; according to a particular embodiment, G represents a group NR.sub.cR.sub.d, according to another particular embodiment, G represents a (C.sub.1-C.sub.6)alkoxy group; R.sub.i and R.sub.i, which may be identical or different, represent a hydrogen atom or a (C.sub.1-C.sub.4)alkyl group; ##STR00067## represents an aryl or heteroaryl group fused to the phenyl ring; or alternatively is absent from the phenyl ring; preferentially, when the ring is present, the ring is a benzo; m represents an integer between 1 and 18 inclusive; particularly an integer between 2 and 16 inclusive; preferentially an integer between 3 and 10; more preferentially an integer between 4 and 6; R.sub.c and R.sub.d, which may be identical or different, represent a hydrogen atom, a (C.sub.2-C.sub.4)alkyl group or a substituted (C.sub.1-C.sub.8)alkyl group, preferably (C.sub.2-C.sub.4)alkyl substituted in particular with one or more groups chosen from i) cyano, ii) (C.sub.1-C.sub.3)alkoxy, iii) hydroxyl and iv) (C.sub.1-C.sub.3)alkylcarbonyl, preferably with one or more hydroxyl groups; and M representing an anionic counterion, derived from a salt of an organic or mineral acid, or from an organic or mineral base that ensures the electrical neutrality of the dye; it being understood that when the dye comprises an alkoxide group, then M and Q.sup.+ may be absent to ensure the electrical neutrality of said dye.

14. Process according to claim 1, characterized in that the fluorescent dye(s) (b) are chosen from the styryl dyes of formula (IX) below, and also the organic or mineral acid or base salts thereof, the optical isomers, geometrical isomers and tautomers thereof, and the solvates thereof such as hydrates: ##STR00068## in which formula (IX) G represents a group NR.sub.cR.sub.d or (C.sub.1-C.sub.6)alkoxy group which is optionally substituted, preferentially unsubstituted: according to a particular embodiment, G represents a group NR.sub.cR.sub.d, according to another particular embodiment, G represents a (C.sub.1-C.sub.6)alkoxy group; G.sub.1 represents a hydrogen atom or a group chosen from NH.sub.2 and OH: R.sub.a, and R.sub.a, which may be identical or different, represent a hydrogen atom, a halogen atom such as fluorine, or an OH, O.sup.Q.sup.+, (C.sub.1-C.sub.6)alkoxy, nitro, or cyano group, wherein Q.sup.+ represents a cationic counterion, derived from a salt of an organic or mineral acid, or from an organic or mineral base that ensures the electrical neutrality of the dye such as alkali metal, alkaline-earth metal or ammonium; R.sub.b, and R.sub.b, which may be identical or different, represent a hydrogen atom or a (C.sub.1-C.sub.6)alkyl group: and m represents an integer between 1 and 18 inclusive: particularly an integer between 2 and 16 inclusive: preferentially an integer between 3 and 10: more preferentially an integer between 4 and 6.

15. Process according to claim 1, characterized in that the fluorescent dye(s) (b) are chosen from the compounds of formulae (X), (XI), (XII) and (XIII) below, and also the organic or mineral acid or base salts thereof, the optical isomers, geometrical isomers and tautomers thereof, and the solvates thereof such as hydrates: ##STR00069## in which formulae (X), (XI), (XII) and (XIII): R.sup.1, R.sup.2, R.sup.3 and R.sup.4, which may be identical or different, represent a hydrogen atom or a (C.sub.1-C.sub.6)alkyl group; preferably, R.sup.2 and R.sup.3 represent a hydrogen atom and R.sup.1 and R.sup.4, which may be identical or different, represent a hydrogen atom or a (C.sub.1-C.sub.4)alkyl group; R.sup.5, R.sup.6, R.sup.7, R.sup.8 and R.sup.9, which may be identical or different, represent i) a hydrogen atom or ii) a halogen atom such as Cl, Br or F, iii) a group OR in which R represents a hydrogen atom or Q.sup.+, or a (C.sub.1-C.sub.3)alkyl group, a group from among iv) aryl such as benzene, v) aryl(C.sub.1-C.sub.3)alkyl such as benzyl, vi) cyano, vii) nitro, viii) (C.sub.1-C.sub.3)alkylthio, ix) amino NR.sup.10R.sup.11 with R.sup.10 and R.sup.11, which may be identical or different, representing a) a hydrogen atom, b) a (C.sub.2-C.sub.4)alkyl group or c) a substituted (C.sub.1-C.sub.8)alkyl group, preferably (C.sub.2-C.sub.4)alkyl optionally substituted with one or more groups chosen from: cyano, (C.sub.1-C.sub.3)alkoxy, hydroxyl, and (C.sub.1-C.sub.3)alkylcarbonyl; in particular, R.sup.10 and R.sup.11, which may be identical or different, represent a hydrogen atom or a (C.sub.1-C.sub.6)alkyl group substituted with one or more hydroxyl, cyano or (C.sub.1-C.sub.3)alkylcarbonyl groups such as hydroxyethyl; m represents an integer between 1 and 18 inclusive; particularly an integer between 2 and 16 inclusive; preferentially an integer between 3 and 10; more preferentially an integer between 4 and 6; M represents an anionic counterion derived from a salt of an organic or mineral acid, or from an organic or mineral base that ensures the electrical neutrality of the dye; and Q.sup.+ represents a cationic counterion, derived from a salt of an organic or mineral acid, or from an organic or mineral base that ensures the electrical neutrality of the dye such as alkali metal, alkaline-earth metal or ammonium; it being understood that when the dye comprises an alkoxide group, then M and Q.sup.+ may be absent to ensure the electrical neutrality of said dye.

16. Process according to claim 15, characterized in that the fluorescent dye(s) (b) of the invention are chosen from those of formulae (XIV) and (XV) below: ##STR00070## in which formulae (XIV) and (XV) R.sup.5, R.sup.7, R.sup.8 and m are: R.sup.5 and R.sup.8, which may be identical or different, represent a hydrogen atom or a (C.sub.1-C.sub.4)alkoxy group such as methoxy, preferably, R.sup.5 and R.sup.8 represent a hydrogen atom; R.sup.7 represents a (C.sub.1-C.sub.4)alkoxy group or NR.sup.10R.sup.11 with R.sup.10 and R.sup.11, which may be identical or different, representing a) a hydrogen atom, or b) a (C.sub.1-C.sub.8)alkyl group optionally substituted with one or more groups chosen from i) hydroxyl, ii) RZC(X)Y with X, Y and Z representing an oxygen or sulfur atom or N(R), or alternatively X and/or Z represent a bond, R and R, which may be identical or different, represent a hydrogen atom or a (C.sub.1-C.sub.6)alkyl group, preferably, X represents an oxygen atom, iii) sulfonic SO.sub.3H, iv) sulfonate SO.sub.3.sup., Q.sup.+, v) carboxylate C(O)O.sup., Q.sup.+ with Q.sup.+ representing a cationic counterion such as an alkali metal or alkaline-earth metal; in particular, R.sup.7 represents a group NR.sup.10R.sup.11 with R.sup.10 and R.sup.11, which may be identical or different, representing a) a hydrogen atom, or b) a (C.sub.1-C.sub.6)alkyl group optionally substituted with one or more groups chosen from i) hydroxyl, ii) carboxyl, iii) carboxylate, iv) sulfonic, and v) sulfonate, more particularly chosen from identical or different groups representing a) a hydrogen atom, or b) a (C.sub.1-C.sub.6)alkyl group optionally substituted with one or more groups chosen from i) hydroxyl, ii) carboxyl, and iii) carboxylate; m represents an integer between 1 and 18 inclusive; particularly an integer between 1 and 6 inclusive; preferentially an integer between 1 and 4; more preferentially an integer between 1 and 2; and M represents an anionic counterion, derived from a salt of an organic or mineral acid, or from an organic or mineral base that ensures the electrical neutrality of the dye; it being understood that when the dye comprises an alkoxide group, then M and Q.sup.+ may be absent to ensure the electrical neutrality of said dye.

17. Process according to claim 15, characterized in that the fluorescent dye(s) (b) are chosen from: the fluorescent dyes of formula (X) with: TABLE-US-00025 R.sup.1 R.sup.2 R.sup.3 R.sup.4 R.sup.5 R.sup.6 R.sup.7 R.sup.8 R.sup.9 m H H H H H H H H H 1 H H H H H t-Bu OH t-Bu H 5 H H H H H t-Bu OH t-Bu H 5 H H H H H H NH.sub.2 H H 1 H H H H H H NH.sub.2 H OCH.sub.3 1 H H H H H H OH Br H 5 H H H H H OCH.sub.3 OH OCH.sub.3 H 5 H H H H Cl H OH H Cl 5 H H H H H H OH H H 10 H H H H H OCH.sub.3 OH OCH.sub.3 H 10 H H H H H t-Bu OH t-Bu H 10 H H H H H H N(CH.sub.2CH.sub.3).sub.2 H H 1 H H H H H H N(CH.sub.2CH.sub.3).sub.2 H H 1 H H H H H H N(CH.sub.2CH.sub.3).sub.2 H H 1 H H H H H t-Bu OH t-Bu H 10 H H H H H H N(CH.sub.2CH.sub.3)CH.sub.2CH.sub.2OH H H 1 H H H H H H N(CH.sub.2CH.sub.3).sub.2 H H 1 H H H H H H N(CH.sub.2CH.sub.3).sub.2 H H 1 H H H H H H N(CH.sub.2CH.sub.3).sub.2 H H 1 H H H H H H N(CH.sub.2CH.sub.3).sub.2 H H 1 H H H H H H N(CH.sub.2CH.sub.3).sub.2 H H 1 H H H H H H N(CH.sub.2CH.sub.3).sub.2 H H 1 H H H H H H N(CH.sub.2CH.sub.3).sub.2 H H 1 H H H H H H N(CH.sub.2CH.sub.3).sub.2 H H 1 H H H H H H N(CH.sub.2CH.sub.3).sub.2 H H 1 H H H H H H n-C.sub.6H.sub.13 H H 1 H H H H H H N(CH.sub.2CH.sub.2OH).sub.2 H H 2 H H H H H H N(n-Bu).sub.2 H H 2 H H H H H OCH.sub.3 OH H H 10 H H H H H H OC.sub.2H.sub.5OH H H 1 H H H H H H OH H H 1 H H benzo H H H H H 1 H H benzo H H N(CH.sub.2CH.sub.2OH).sub.2 H H 1 H H benzo H H N(CH.sub.2CH.sub.2OH).sub.2 H H 1 and also the organic or mineral acid or base salts thereof, the optical isomers, geometrical isomers and tautomers thereof, and the solvates thereof such as hydrates; the fluorescent dyes of formula (XI) with: TABLE-US-00026 R.sup.1 R.sup.2 R.sup.3 R.sup.4 R.sup.5 R.sup.6 R.sup.7 R.sup.8 R.sup.9 m CH.sub.3 H H H OH H OCH.sub.3 H H 2 CH.sub.3 H H H H H OCH.sub.3 OCH.sub.2-Ph H 2 CH.sub.3 H H H H H H H OCH.sub.3 2 CH.sub.3 H H H F H H H H 2 CH.sub.3 H H H H H H OPh H 2 CH.sub.3 H H H H H N(CH.sub.2CH.sub.2OAc).sub.2 H H 2 CH.sub.3 H H H OCH.sub.3 H OCH.sub.3 OCH.sub.3 H 2 CH.sub.3 H H H H H H CH.sub.3 H 2 CH.sub.3 H H H H H OH H H 2 CH.sub.3 H H H H OCH.sub.3 OCH.sub.3 OCH.sub.3 H 2 CH.sub.3 H H H H OCH.sub.3 OH OH H 2 CH.sub.3 H H H H H OCH.sub.3 OCH.sub.3 OCH.sub.3 2 CH.sub.3 H H H H H H OCH.sub.3 OH 2 CH.sub.3 H H H H H N(n-butyl).sub.2 H H 2 CH.sub.3 H H H H OCH.sub.3 OCH.sub.3 H H 2 CH.sub.3 H H H H H H H H 2 CH.sub.3 H H H H H i-propyl H H 2 H H H H H H OH H H 6 H H H H H OCH.sub.3 OCH.sub.3 OCH.sub.3 H 6 H H H H OH H OCH.sub.3 H H 2 H H H H OCH.sub.3 H H OCH.sub.3 OCH.sub.3 2 H H H H H H H H Br 2 H H H H H H OH H H 2 H H H H OCH.sub.3 OCH.sub.3 OCH.sub.3 H H 6 H H H H OH OCH.sub.3 H H H 6 H H H H H OCH.sub.3 OCH.sub.3 H H 6 H H H H H OCH.sub.3 OCH.sub.3 H H 2 H H H H H H C(O)OH H H 6 H H H H H H C(O)OH H H 2 H H H H H H i-propyl H H 2 H H H H H H N(CH.sub.3)CH.sub.2CH.sub.2CN H H 2 H H H H H H OCH.sub.3 OCH.sub.2Ph H 2 H H H H H H H OPh H 2 H H H H H H N(CH.sub.2CH.sub.2C(O)CH.sub.3).sub.2 H H 2 H H H H OH H OCH.sub.3 H H 6 H H H H H OCH.sub.3 OCH.sub.3 OCH.sub.3 H 2 H H H H OCH.sub.3 H OCH.sub.3 OCH.sub.3 H 6 H H H H H H H CH.sub.3 H 2 H H H H H H N(CH.sub.3)CH.sub.2CH.sub.2OH H H 2 and also the organic or mineral acid or base salts thereof, the geometrical isomers and tautomers thereof, and the solvates thereof such as hydrates; the fluorescent dyes of formulae (X) and (XI): ##STR00071## wherein M represents an anionic counterion, derived from a salt of an organic or mineral acid, or from an organic or mineral base that ensures the electrical neutrality of the dye; and TABLE-US-00027 R.sup.5 R.sup.7 R.sup.8 m H N(CH.sub.2CH.sub.2OH).sub.2 H 2 H N(CH.sub.2CH.sub.2OH).sub.2 H 3 H N(CH.sub.2CH.sub.2OH).sub.2 H 4 H N(CH.sub.2CH.sub.2OH).sub.2 H 5 H N(CH.sub.2CH.sub.2OH).sub.2 H 6 H N(CH.sub.2CH.sub.2OH).sub.2 H 8 H N(CH.sub.2CH.sub.2OH).sub.2 H 10 H N(CH.sub.2CH.sub.2OH).sub.2 H 12 H N(CH.sub.2CH.sub.2OH).sub.2 H 14 H N(CH.sub.2CH.sub.2OH).sub.2 H 16 H CH.sub.3CH.sub.2N(CH.sub.2CH.sub.2OH) H 2 H CH.sub.3CH.sub.2N(CH.sub.2CH.sub.2OH) H 4 and TABLE-US-00028 R.sup.5 R.sup.7 R.sup.8 m OCH.sub.3 OCH.sub.3 OCH.sub.3 2 OCH.sub.3 OCH.sub.3 OCH.sub.3 3 OCH.sub.3 OCH.sub.3 OCH.sub.3 3 OCH.sub.3 OCH.sub.3 OCH.sub.3 4 OCH.sub.3 OCH.sub.3 OCH.sub.3 5 OCH.sub.3 OCH.sub.3 OCH.sub.3 8 OCH.sub.3 OCH.sub.3 OCH.sub.3 10 OCH.sub.3 OCH.sub.3 OCH.sub.3 12 OCH.sub.3 OCH.sub.3 OCH.sub.3 14 OCH.sub.3 OCH.sub.3 OCH.sub.3 16 and also the organic or mineral acid or base salts thereof, the geometrical isomers and tautomers thereof, and the solvates thereof such as hydrates; the fluorescent dyes of formula (XII) with: TABLE-US-00029 R.sup.1 R.sup.2 R.sup.3 R.sup.4 R.sup.5 R.sup.6 R.sup.7 R.sup.8 R.sup.9 m H H H H H H OCH.sub.3 OCH.sub.3 OCH 2 H H H H OH OCH.sub.3 H H H 2 H H H H H H H H H 2 H H H H H OCH.sub.3 OCH.sub.3 H H 2 H H H H OH H OH H H 6 H H H H OCH.sub.3 H OCH.sub.3 OCH.sub.3 H 6 H H H H H H OH H H 6 H H H H OCH.sub.3 H H H F 2 H H H H H H C(O)OH H H 2 H H H H H H Isopropyl H H 2 H H H H H H N(CH.sub.2CH.sub.2C(O)CH.sub.3).sub.2 H H 2 H H H H OH H OCH.sub.3 H H 2 H H H H H H OH H H 2 H H H H H OCH.sub.3 OH OH H 2 H H H H H CH.sub.3 OCH.sub.2Ph CH.sub.3 H 2 H H H H H OCH.sub.3 OCH.sub.3 OCH.sub.3 H 2 H H H H H OCH.sub.3 OCH.sub.3 OCH.sub.3 H 6 H H H H H H N(CH.sub.3).sub.2 H H 6 H H H H H H OCH.sub.3 OCH.sub.3 OCH.sub.3 6 H H H H H H Phenyl H H 6 H H H H H OCH.sub.3 OCH.sub.3 H H 6 H H H H H H C(O)OH H H 6 H H H H H H N(n-Butyl).sub.2 H H 2 H H H H H H OCH.sub.3 OCH.sub.3 H 3 H H H H H H OCH.sub.3 OCH.sub.3 H 2 H H H H H H OCH.sub.3 OCH.sub.3 H 5 H H H H H H OCH.sub.3 H H 3 H H H H H H N(CH.sub.3).sub.2 H H 3 H H H H H H H H H 3 and also the organic or mineral acid or base salts thereof, the optical isomers, geometrical isomers and tautomers thereof, and the solvates thereof such as hydrates; the fluorescent dyes of formula (XIII) with: TABLE-US-00030 R.sup.1 R.sup.2 R.sup.3 R.sup.4 R.sup.5 R.sup.6 R.sup.7 R.sup.8 R.sup.9 m CH.sub.3 H H H OH H OCH.sub.3 H H 2 CH.sub.3 H H H H H OCH.sub.3 OCH.sub.2-Ph H 2 CH.sub.3 H H H H H H H OCH.sub.3 2 CH.sub.3 H H H F H H H H 2 CH.sub.3 H H H H H H OPh H 2 CH.sub.3 H H H H H N(CH.sub.2CH.sub.2OAc).sub.2 H H 2 CH.sub.3 H H H OCH.sub.3 H OCH.sub.3 OCH.sub.3 H 2 CH.sub.3 H H H H H H CH.sub.3 H 2 CH.sub.3 H H H H H OH H H 2 CH.sub.3 H H H H OCH.sub.3 OCH.sub.3 OCH.sub.3 H 2 CH.sub.3 H H H H OCH.sub.3 OH OH H 2 CH.sub.3 H H H H H OCH.sub.3 OCH.sub.3 OCH.sub.3 2 CH.sub.3 H H H H H H OCH.sub.3 OH 2 CH.sub.3 H H H H H N(n-butyl).sub.2 H H 2 CH.sub.3 H H H H OCH.sub.3 OCH.sub.3 H H 2 CH.sub.3 H H H H H H H H 2 CH.sub.3 H H H H H i-propyl H H 2 H H H H H H OH H H 6 H H H H H OCH.sub.3 OCH.sub.3 OCH.sub.3 H 6 H H H H OH H OCH.sub.3 H H 2 H H H H OCH.sub.3 H H OCH.sub.3 OCH.sub.3 2 H H H H H H H H Br 2 H H H H H H OH H H 2 H H H H H H N(CH.sub.3).sub.2 H H 6 H H H H OCH.sub.3 OCH.sub.3 OCH.sub.3 H H 6 H H H H OH OCH.sub.3 H H H 6 H H H H H OCH.sub.3 OCH.sub.3 H H 6 H H H H H OCH.sub.3 OCH.sub.3 H H 2 H H H H H H C(O)OH H H 6 H H H H H H C(O)OH H H 2 H H H H H H i-propyl H H 2 H H H H H H N(CH.sub.3)CH.sub.2CH.sub.2CN H H 2 H H H H H H OCH.sub.3 OCH.sub.2Ph H 2 H H H H H H H OPh H 2 H H H H H H N(CH.sub.2CH.sub.2C(O)CH.sub.3).sub.2 H H 2 H H H H OH H OCH.sub.3 H H 6 H H H H H OCH.sub.3 OCH.sub.3 OCH.sub.3 H 2 H H H H OCH.sub.3 H OCH.sub.3 OCH.sub.3 H 6 H H H H H H H CH.sub.3 H 2 H H H H H H N(CH.sub.3)CH.sub.2CH.sub.2OH H H 2 CH.sub.3 H H H H H N(CH.sub.3).sub.2 H H 2 and also the organic or mineral acid or base salts thereof, the geometrical isomers and tautomers thereof, and the solvates thereof such as hydrates; and the fluorescent dyes of formulae (XII) and (XIII) below: ##STR00072## with: TABLE-US-00031 R.sup.5 R.sup.7 R.sup.8 m H N(CH.sub.2CH.sub.2OH).sub.2 H 2 H N(CH.sub.2CH.sub.2OH).sub.2 H 3 H N(CH.sub.2CH.sub.2OH).sub.2 H 4 H N(CH.sub.2CH.sub.2OH).sub.2 H 5 H N(CH.sub.2CH.sub.2OH).sub.2 H 6 H N(CH.sub.2CH.sub.2OH).sub.2 H 8 H N(CH.sub.2CH.sub.2OH).sub.2 H 10 H N(CH.sub.2CH.sub.2OH).sub.2 H 12 H N(CH.sub.2CH.sub.2OH).sub.2 H 14 H N(CH.sub.2CH.sub.2OH).sub.2 H 16 TABLE-US-00032 R.sup.5 R.sup.7 R.sup.8 m OCH.sub.3 OCH.sub.3 OCH.sub.3 2 OCH.sub.3 OCH.sub.3 OCH.sub.3 3 OCH.sub.3 OCH.sub.3 OCH.sub.3 3 OCH.sub.3 OCH.sub.3 OCH.sub.3 4 OCH.sub.3 OCH.sub.3 OCH.sub.3 5 OCH.sub.3 OCH.sub.3 OCH.sub.3 8 OCH.sub.3 OCH.sub.3 OCH.sub.3 10 OCH.sub.3 OCH.sub.3 OCH.sub.3 12 OCH.sub.3 OCH.sub.3 OCH.sub.3 14 OCH.sub.3 OCH.sub.3 OCH.sub.3 16 and and also the organic or mineral acid or base salts thereof, the geometrical isomers and tautomers thereof, and the solvates thereof such as hydrates; and preferably, the fluorescent dye(s) (b) are chosen from the following compounds: ##STR00073## ##STR00074## and also the organic or mineral acid or base salts thereof, the geometrical isomers and tautomers thereof, and the solvates thereof such as hydrates; wherein M represents an anionic counterion, derived from a salt of an organic or mineral acid, or from an organic or mineral base that ensures the electrical neutrality of the dye; and Q.sup.+ represents a cationic counterion such as an alkali metal or alkaline-earth metal, it being understood that when the dye comprises an alkoxide group, then M and Q.sup.+ may be absent to ensure the electrical neutrality of said dye.

18. Process according to claim 1, characterized in that it also comprises the application to said keratin fibres of one or more reducing agents, preferably chosen from i) the reducing agents of formula (XVI) below, and also the addition salts thereof, and mixtures thereof:
H(X).sub.q(R.sub.10).sub.t(XVI) in which formula (XVI): X represents P, S or SO.sub.2, q represents an integer equal to 0 or 1, t represents an integer equal to 1 or 2, and R represents a linear or branched, saturated or unsaturated C.sub.1 to C.sub.20 alkyl radical, optionally interrupted with a heteroatom, and/or optionally substituted with one or more radicals chosen from hydroxyl, halo, amine, carboxyl, ((C.sub.1-C.sub.30)alkoxy)carbonyl, amido, ((C.sub.1-C.sub.30)alkyl)aminocarbonyl, ((C.sub.1-C.sub.30)acyl)amino, mono or dialkylamino, and mono or dihydroxylamino radicals; ii) thioglycolic acid, iii) thiolactic acid, iv) glyceryl monothioglycolate, v) cysteamine, vi) N-acetylcysteamine, vii) N-propionylcysteamine, viii) cysteine, ix) N-acetylcysteine, x) thiomalic acid, xi) pantetheine, xii) 2,3-dimercaptosuccinic acid, xiii) N-(mercaptoalkyl)-o-hydroxyalkylamides, xiv) N-mono- or N,N-dialkylmercapto-4-butyramides, xv) aminomercaptoalkylamides, xvi) N-(mercaptoalkyl)succinamic acid derivatives, xvii) N-(mercaptoalkyl)succinimide derivatives, xviii) alkylamino mercaptoalkylamides, xix) the azeotropic mixture of 2-hydroxypropyl thioglyconate and of (2-hydroxy-1-methyl)ethyl thioglycolate, xx) mercaptoalkylaminoamides, xxi) N-mercaptoalkylalkanediamides xxii) formamidinesulfinic acid derivatives, addition salts thereof, and mixtures thereof.

19. Process according to claim 1, characterized in that it does not use any reducing agent.

20. Process according to claim 1, characterized in that the triarylmethane dye(s) (a), and the fluorescent dye(s) (b), are applied together to the keratin fibres; preferably, the process comprises a step of applying to the keratin fibres a cosmetic composition which comprises one or more triarylmethane dyes (a) chosen from the compounds of formula (I), and also the optical isomers thereof, the geometrical isomers thereof, the tautomers thereof, the organic or mineral acid or base salts thereof, the solvates thereof such as hydrates, and mixtures thereof, and one or more fluorescent dyes (b).

21. Process according to claim 1, characterized in that it comprises at least the following two successive steps: a first step of applying to said keratin fibres a cosmetic composition comprising one or more fluorescent dyes (b), followed by, a second step of applying to said fibres a cosmetic composition comprising one or more triarylmethane dyes (a) chosen from the compounds of formula (I), and also the optical isomers thereof, the geometrical isomers thereof, the tautomers thereof, the organic or mineral, acid or base salts thereof, the solvates thereof such as hydrates, and mixtures thereof.

22. Process according to claim 1, characterized in that it comprises at least the following two successive steps: a first step of applying to said keratin fibres a cosmetic composition comprising one or more triarylmethane dyes (a) chosen from the compounds of formula (I), and also the optical isomers thereof, the geometrical isomers thereof, the tautomers thereof, the organic or mineral, acid or base salts thereof, the solvates thereof such as hydrates, and mixtures thereof, followed by a second step of applying to said fibres a cosmetic composition comprising one or more fluorescent dyes (b).

23. Process according to claim 22, characterized in that it comprises at least two successive steps in which the pH of the cosmetic composition(s) is between 6 and 11 inclusive, preferably between 7 and 10, more preferentially between 7.5 and 9.5 and better still between 9 and 9.5.

24. Cosmetic composition comprising one or more triarylmethane dyes (a) chosen from the compounds of formula (I), and also the optical isomers thereof, the geometrical isomers thereof, the tautomers thereof, the organic or mineral acid or base salts thereof, the solvates thereof such as hydrates, and mixtures thereof, and one or more fluorescent dyes (b), said composition optionally having a pH of between 6 and 11 inclusive, preferably between 7 and 10, more preferentially between 7.5 and 9.5 and better still between 9 and 9.5.

25. Multi-compartment device comprising a first compartment containing one or more triarylmethane dyes (a) chosen from the compounds of formula (I), and also the optical isomers thereof, the geometrical isomers thereof, the tautomers thereof, the organic or mineral acid or base salts thereof, the solvates thereof such as hydrates, and mixtures thereof, and a second compartment containing one or more fluorescent dyes (b).

26. Use of one or more fluorescent dye(s) (b), combined with one or more triarylmethane dye(s) (a) chosen from the compounds of formula (I), and also the optical isomers thereof, the geometrical isomers thereof, the tautomers thereof, the organic or mineral acid or base salts thereof, the solvates thereof such as hydrates, and mixtures thereof, for the dyeing of light keratin fibres, especially human keratin fibres such as the hair, in chestnut-brown, dark chestnut-brown, brown, brown with a glint or even black, without using an additional dye other than (a) or (b).

Description

EXAMPLES

[0367] In the examples that follow, all the amounts are given as weight percentages relative to the total weight of the composition, unless otherwise indicated.

I. First Example of Combined Application

a) Preparation of the Compositions

[0368] Composition (A1) comprising a triarylmethane dye of formula (I) according to the invention, was prepared from the ingredients whose contents are mentioned in the table below.

TABLE-US-00010 Composition A1 [00041] 0.2 Monoethanolamine pH = 4 Water qs 100

[0369] Compositions (B1) and (B2), comprising a fluorescent dye, were prepared from the ingredients whose contents are mentioned in the table below.

TABLE-US-00011 Composition B1 Composition B2 [00042] 0.2 [00043] 0.2 Monoethanolamine pH = 4 pH = 4 Water qs 100 qs 100

b) Procedure

[0370] Compositions (A1), (B1) and (B2) obtained above were mixed so as to obtain the following mixtures: [0371] A1+B1 in a 1/1 ratio, and [0372] A1+B2 in a 1/1 ratio.

[0373] 10 ml of compositions (A1), (B1), (B2), (A1+B1) and (A1+B2) were applied to 1 g locks of hair.

[0374] After a leave-on time of 20 minutes at room temperature, the locks of hair were rinsed with water and wrung dry.

[0375] The locks were then subjected to 10 shampoo washes, made up of two cycles of five shampoo washes. After each shampoo wash cycle, the locks were dried and the colour of the locks was measured using a Minolta CM2600d spectrocolorimeter (specular components included, 10 angle, illuminant D65) in the CIEL*a*b* system.

[0376] In this system, L* represents the intensity of the colour, a* indicates the green/red colour axis and b* the blue/yellow colour axis.

[0377] The lower the value of L*, the darker or more intense the colour. The higher the value of a*, the redder the shade, and the higher the value of b*, the yellower the shade.

c) Results

[0378] The results of the colouring on the locks of hair containing 90% white hairs are given in the table below.

TABLE-US-00012 Colour L* a* b* Al Intense 40.50 15.66 15.51 blue B1 Red 40.68 51.77 45.37 B2 Red 42.29 48.07 44.34 A1 + B1 Brown 20.29 5.88 5.05 A1 + B2 Black 19.02 0.28 5.53

[0379] The results obtained above show that the simultaneous application of a triarylmethane dye of formula (I) according to the present invention and of a fluorescent dye makes it possible to obtain very intense and chromatic colours.

[0380] These results also show that the process according to the invention, using only two particular direct dyes, a triarylmethane dye of formula (I) combined with a fluorescent dye, makes it possible to obtain brown colours, which are persistent even after 10 shampoo washes.

II. Second Example of Combined Application

[0381] a) Preparation of the compositions

[0382] Composition (A2) comprising a triarylmethane dye of formula (I) according to the invention, was prepared from the ingredients whose contents are mentioned in the table below.

TABLE-US-00013 Composition A2 [00044] 0.2 Monoethanolamine pH = 9.5 Water qs 100

[0383] Compositions (B3) and (B4), comprising a fluorescent dye, were prepared from the ingredients whose contents are mentioned in the table below.

TABLE-US-00014 Composition B3 Composition B4 [00045] 0.2 [00046] 0.2 Monoethanolamine pH = 9.5 pH = 9.5 Water qs 100 qs 100

b) Procedure

[0384] Compositions (A2), (B3) and (B4) obtained above were mixed so as to obtain the following mixtures: [0385] A2+B3 in a 1/1 ratio, and [0386] A2+B4 in a 1/1 ratio.

[0387] 10 ml of compositions (A2), (B3), (B4), (A2+B3) and (A2+B4) were applied to 1 g locks of hair.

[0388] After a leave-on time of 20 minutes at room temperature, the locks of hair were rinsed with water and wrung dry.

[0389] The locks were then subjected to 10 shampoo washes, made up of two cycles of five shampoo washes. After each shampoo wash cycle, the locks were dried and the colour of the locks was measured using a Minolta CM2600d spectrocolorimeter (specular components included, 10 angle, illuminant D65) in the CIEL*a*b* system.

[0390] In this system, L* represents the intensity of the colour, a* indicates the green/red colour axis and b* the blue/yellow colour axis.

[0391] The lower the value of L*, the darker or more intense the colour. The higher the value of a*, the redder the shade, and the higher the value of b*, the yellower the shade.

c) Results

[0392] The results of the colouring on the locks of hair containing 90% white hairs are given in the table below.

TABLE-US-00015 Colour L* a* b* A2 Intense blue 37.20 13.47 16.12 B3 Red 41.02 49.23 44.44 B4 Red 38.42 46.87 38.15 A2 + B3 Brown with 18.66 9.75 13.69 mahogany glints A2 + B4 Brown with 19.73 6.43 10.28 mahogany glints

[0393] The results obtained above show that the simultaneous application of a triarylmethane dye of formula (I) according to the present invention and of a fluorescent dye makes it possible to obtain very intense and chromatic colours.

[0394] These results also show that the process according to the invention, using only two particular direct dyes, a triarylmethane dye of formula (I) combined with a fluorescent dye, makes it possible to obtain brown colours, which are persistent even after 10 shampoo washes.

III. Comparative Example

a) Preparation of the Compositions

[0395] Composition (A3) comprising a triarylmethane dye of formula (I) according to the invention, was prepared from the ingredients whose contents are mentioned in the table below.

TABLE-US-00016 Composition A3 [00047] 0.2 Monoethanolamine pH = 9.5 Water qs 100

[0396] Composition (B5), comprising a fluorescent dye as defined in the patent application EP 1 133 975, was prepared from the ingredients whose contents are mentioned in the table below.

TABLE-US-00017 Composition B5 [00048] 0.2 Monoethanolamine pH = 9.5 Water qs 100

b) Procedure

[0397] Compositions (A3) and (B5) obtained above were mixed so as to obtain the mixture (A3+B5) in a 1/1 ratio.

[0398] 10 ml of compositions (A3), (B5) and (A3+B5) were applied to 1 g locks of hair.

[0399] After a leave-on time of 20 minutes at room temperature, the locks of hair were rinsed with water and wrung dry.

[0400] The locks were then subjected to one shampoo wash, and the colour of the locks was measured using a Minolta CM2600d spectrocolorimeter (specular components included, 10 angle, illuminant D65) in the CIEL*a*b* system.

[0401] In this system, L* represents the intensity of the colour, a* indicates the green/red colour axis and b* the blue/yellow colour axis.

[0402] The lower the value of L*, the darker or more intense the colour. The higher the value of a*, the redder the shade, and the higher the value of b*, the yellower the shade.

c) Results

[0403] The results of the colouring on the locks of hair containing 90% white hairs are given in the table below.

TABLE-US-00018 Colour L* a* b* A3 Intense 42.07 8.33 14.86 blue B5 Yellow 56.35 5.71 66.38 A3 + B5 Green 40.68 19.27 21.98

[0404] The results obtained above show that the association of a triarylmethane dye of formula (I) according to the present invention and of a fluorescent dye, which is not chosen from cyanin, styryl/hemicyanin, and naphthalimide dyes, is not able to provide brown colours.

IV. Third Example of Combined Application

a) Preparation of the Compositions

[0405] Composition (A4) comprising a triarylmethane dye of formula (I) according to the invention, was prepared from the ingredients whose contents are mentioned in the table below.

TABLE-US-00019 Composition A4 [00049] 10.sup.-3 mol % Monoethanolamine pH = 9.5 Water qs 100

[0406] Compositions (B6) and (B7), comprising a fluorescent dye according to the present invention, were prepared from the ingredients whose contents are mentioned in the table below.

TABLE-US-00020 Composition B6 Composition B7 [00050] 10.sup.-3 mol % [00051] 10.sup.-3 mol % Monoethanolamine pH = 9.5 pH = 9.5 Water qs 100 qs 100

b) Procedure

[0407] Compositions (A4), (B6) and (B7) obtained above were mixed so as to obtain the following mixtures: [0408] A4+B6 in a final concentration of 5*10.sup.4 mol %, and [0409] A4+B7 in a final concentration of 5*10.sup.4 mol %.

[0410] 10 ml of compositions (A4), (B6), (B7), (A4+B6) and (A4+B7) were applied to 1 g locks of hair. Compositions (A4), (B6) and (B7) were also applied in a final concentration of 5*10.sup.4 mol %.

[0411] After a leave-on time of 20 minutes at room temperature, the locks of hair were rinsed with water and wrung dry.

[0412] The locks were then subjected to one shampoo wash, and the colour of the locks was measured using a Minolta CM2600d spectrocolorimeter (specular components included, 10 angle, illuminant D65) in the CIEL*a*b* system.

[0413] In this system, L* represents the intensity of the colour, a* indicates the green/red colour axis and b* the blue/yellow colour axis.

[0414] The lower the value of L*, the darker or more intense the colour. The higher the value of a*, the redder the shade, and the higher the value of b*, the yellower the shade.

c) Results

[0415] The results of the colouring on the locks of hair containing 90% white hairs are given in the table below.

TABLE-US-00021 Colour L* a* b* A4 Intense blue 34.58 13.32 22.83 B6 Red 39.51 51.04 42.13 B7 Orange 44.21 40.41 42.88 A4 + B6 Brown 22.03 15.07 13.77 A4 + B7 Brown with 29.21 7.01 10.76 green glints

[0416] The results obtained above show that the simultaneous application of a triarylmethane dye of formula (I) according to the present invention and of a fluorescent dye, chosen from cyanin, styryl/hemicyanin, and naphthalimide dyes, makes it possible to obtain very intense and chromatic colours.

[0417] These results also show that the process according to the invention, using only two particular direct dyes, a triarylmethane dye of formula (I) combined with a specific fluorescent dye, makes it possible to obtain brown colours, as well as brown with glints.

IV. Second Comparative Example of Combined Application

a) Preparation of the Compositions

[0418] Composition (A5) comprising a triarylmethane dye of formula (I) according to the invention, was prepared from the ingredients whose contents are mentioned in the table below.

TABLE-US-00022 Composition A5 [00052] 10.sup.-3 mol % Monoethanolamine pH = 9.5 Water qs 100

[0419] Composition (B6), comprising a fluorescent dye according to the present invention, and composition (B8), comprising a fluorescent dye as defined in the patent application EP 1 133 975, were prepared from the ingredients whose contents are mentioned in the table below.

TABLE-US-00023 Composition B6 Composition B8 [00053] 10.sup.-3 mol % [00054] 10.sup.-3 mol % Monoethanolamine pH = 9.5 pH = 9.5 Water qs 100 qs 100

b) Procedure

[0420] Compositions (A4), (B6) and (B8) obtained above were mixed so as to obtain the following mixtures: [0421] A5+B6 in a final concentration of 5*10.sup.4 mol %, and [0422] A5+B8 in a final concentration of 5*10.sup.4 mol %.

[0423] 10 ml of compositions (A5), (B6), (B8), (A5+B6) and (A5+B8) were applied to 1 g locks of hair. Compositions (A4), (B6) and (B8) were also applied in a final concentration of 5* 10.sup.4 mol %.

[0424] After a leave-on time of 20 minutes at room temperature, the locks of hair were rinsed with water and wrung dry.

[0425] The locks were then subjected to one shampoo wash, and the colour of the locks was measured using a Minolta CM2600d spectrocolorimeter (specular components included, 10 angle, illuminant D65) in the CIEL*a*b* system.

[0426] In this system, L* represents the intensity of the colour, a* indicates the green/red colour axis and b* the blue/yellow colour axis.

[0427] The lower the value of L*, the darker or more intense the colour. The higher the value of a*, the redder the shade, and the higher the value of b*, the yellower the shade.

c) Results

[0428] The results of the colouring on the locks of hair containing 90% white hairs are given in the table below.

TABLE-US-00024 Colour L* a* b* A5 Intense blue 41.45 8.63 13.11 B6 Red 39.51 51.04 42.13 B8 Yellow 61.48 6.86 71.59 A5 + B6 Brown with 27.05 18.11 15.97 mahogany glints A5 + B8 Green 36.03 14.49 17.4

[0429] The results obtained above show that the simultaneous application of a triarylmethane dye of formula (I) according to the present invention and of a fluorescent dye, chosen from cyanin, styryl/hemicyanin, and naphthalimide dyes (A5+B6), makes it possible to obtain very intense and chromatic colours.

[0430] These results also show that the process according to the invention, using only two particular direct dyes, a triarylmethane dye of formula (I) combined with a specific fluorescent dye, makes it possible to obtain brown colours.

[0431] In comparison, the association of a triarylmethane dye of formula (I) according to the present invention and of a fluorescent dye, which is not chosen from cyanin, styryl/hemicyanin, and naphthalimide dyes (A5+B8), is not able to provide brown colours and provide only green shades.