The present application relates to a colouring solid particle for dyeing keratin fibres, in particular human keratin fibres such as the hair, comprising a core containing one or more direct dyes and/or one or more oxidation dye precursors and an upper coating layer covering said core and containing one or more cellulose ethers. The present application also relates to a process for preparing a dye composition comprising one or more colouring solid particles, to a process for the oxidation dyeing of keratin fibres, comprising the application of the composition obtained to said fibres, and to the use of this composition for dyeing keratin fibres.

The present application relates to a colouring solid particle for dyeing keratin fibres, in particular human keratin fibres such as the hair, comprising a core containing one or more direct dyes and/or one or more oxidation dye precursors and an upper coating layer covering said core and containing one or more cellulose ethers. The present application also relates to a process for preparing a dye composition comprising one or more colouring solid particles, to a process for the oxidation dyeing of keratin fibres, comprising the application of the composition obtained to said fibres, and to the use of this composition for dyeing keratin fibres.

The present patent application relates to a process for preparing a composition for dyeing keratin fibres, in particular human keratin fibres such as the hair, comprising a step of mixing several identical or different solid particles comprising one or more dyes, preferably one or more oxidation dye precursors, with an oxidizing aqueous composition, followed by a step of adding an alkaline aqueous composition preferably comprising arginine. The present patent application also relates to a dyeing process using the composition obtained.

The present patent application relates to a process for preparing a composition for dyeing keratin fibres, in particular human keratin fibres such as the hair, comprising a step of mixing several identical or different solid particles comprising one or more dyes, preferably one or more oxidation dye precursors, with an oxidizing aqueous composition, followed by a step of adding an alkaline aqueous composition preferably comprising arginine. The present patent application also relates to a dyeing process using the composition obtained.

It is an object of the present disclosure to provide a method for treating keratinous material, in particular human hair, wherein there is applied to the keratinous material a first composition (A) comprising (A1) one or more organic C.sub.1-C.sub.6 alkoxy silanes and/or condensation products thereof, and a second composition (B) comprising (B1) a first cellulose and (B2) a second cellulose different from the first cellulose (B1).

It is an object of the present disclosure to provide a method for treating keratinous material, in particular human hair, wherein there is applied to the keratinous material a first composition (A) comprising (A1) one or more organic C.sub.1-C.sub.6 alkoxy silanes and/or condensation products thereof, and a second composition (B) comprising (B1) a first cellulose and (B2) a second cellulose different from the first cellulose (B1).

The present invention relates to a multiple-compartment device (1) composed of a closed envelop (2) divided in at least two distinct compartments (7a) and (7b) separated from one another by at least one internal frangible seal (8), wherein one of the compartments (7a) containing a composition (A), comprising one oxidation dye precursor, one anionic surfactant, one amphoteric surfactant chosen from betaine; and another one of the compartments (7b) containing an oxidizing composition (B) comprising at least one oxidizing agent.

The present invention relates to a multiple-compartment device (1) composed of a closed envelop (2) divided in at least two distinct compartments (7a) and (7b) separated from one another by at least one internal frangible seal (8), wherein one of the compartments (7a) containing a composition (A), comprising one oxidation dye precursor, one anionic surfactant, one amphoteric surfactant chosen from betaine; and another one of the compartments (7b) containing an oxidizing composition (B) comprising at least one oxidizing agent.

A hair dyeing method that involves first step of applying on the hair a hair dye composition containing a compound represented by the following general formula (1A) or a salt thereof and an organic alkaline agent and having a pH of 9.0 or more and 11.0 or less:

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wherein a broken line represents the presence or absence of a π bond; R.sup.1 represents a hydroxy group or an acetoxy group; and R.sup.2 represents a hydrogen atom, an acetyl group, a methyl group, or an ethyl group; and a second step of applying on the hair a hair treatment agent containing an organic acid or a salt thereof and having a pH of 5.5 or less. After performing the first step, the hair is subjected to the second step while maintaining in a wet state in which an amount of water per gram of the hair is 0.008 g or more.

A hair dyeing method that involves first step of applying on the hair a hair dye composition containing a compound represented by the following general formula (1A) or a salt thereof and an organic alkaline agent and having a pH of 9.0 or more and 11.0 or less:

##STR00001##

wherein a broken line represents the presence or absence of a π bond; R.sup.1 represents a hydroxy group or an acetoxy group; and R.sup.2 represents a hydrogen atom, an acetyl group, a methyl group, or an ethyl group; and a second step of applying on the hair a hair treatment agent containing an organic acid or a salt thereof and having a pH of 5.5 or less. After performing the first step, the hair is subjected to the second step while maintaining in a wet state in which an amount of water per gram of the hair is 0.008 g or more.