Disclosed is a method of strengthening hair fibers using a hair composition comprising an amide and/or an alkyl ammonium carboxylate salt. The amide can be a monoamide and/or a bisamide. A method of protecting dyed hair color from fading or wash-out using the hair composition is also included.

A method of treating a material, the method comprising the steps of: (1) contacting the material with a composition comprising an electrophilic species selected from aldehydes, succinimidyl esters, and mixtures thereof; (2) contacting the material with a composition comprising a chelating agent and/or a salt of an amine and/or a carboxylic acid.

A method of combating colour loss from a dyed material, the method comprising contacting the material with a composition comprising a compound of formula (I): (I) wherein R is an optionally substituted hydrocarbyl group having at least 5 carbon atoms, and R is hydrogen or a solubilising group.

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A method of combatting colour loss from a dyed material, the method comprising the steps of: (1) contacting the material with a composition comprising an electrophilic species selected from aldehydes, succinimidyl esters, and mixtures thereof; (2) contacting the material with a composition comprising a chelating agent and/or a salt of an amine and/or a carboxylic acid.

Hair treatment agents and methods for treating hair are presented herein. An exemplary hair treatment agent includes, based on its weight, (a) from about 0.001 to about 10 wt. % of at least one succinimidyl ester, and (b) from about 0.001 to about 20 wt. % of at least one proteolipid of formula (II) RXR. In formula (II), R represents a straight-chain or branched, saturated or unsaturated hydrocarbon functional group having 11 to 24 carbon atoms; R represents a protein, a peptide or a protein hydrolysate; and X represents C(O)O or N.sup.+(R.sup.III.sub.2)R.sup.IV or N(R.sup.III)R.sup.IV or C(O)N(R.sup.V)R.sup.VI, where R.sup.III represents (CH.sub.2).sub.xCH.sub.3, where x=0-22, and R.sup.IV represents CH.sub.2CH(OH)CH.sub.2 or (CH.sub.2).sub.X, where x=0-22; and R.sup.V and R.sup.VI represent, independently of one another, H or (CH.sub.2).sub.XCH.sub.3, where x=0-22; wherein R represents keratin or a keratin hydrolyzate when X represents C(O)O.

Hair treatment agents and methods for treating hair are provided. An exemplary hair treatment agent includes, based on the weight of the hair treatment agent, from about 0.001 to about 20 wt. % of at least one alpha-substituted aldehyde, at least one bivalent or trivalent metal salt, and at least one organic acid.

Hair treatment products comprising, in relation to its weight, from about 0.001 to about 20% by weight of at least one alpha-substituted aldehyde and from about 0.001 to about 20% by weight of at least one proteolipid of formula (II) RXR, in which R represents a straight-chain or branched, saturated or unsaturated hydrocarbon radical having 11 to 24 carbon atoms, R represents a protein, a peptide or a protein hydrolysate, X represents C(O)O or N.sup.+(R.sup.III.sub.2)R.sup.IV or N(R.sup.III)R.sup.IV or C(O)N(R.sup.V)R.sup.V I, R.sup.III represents (CH.sub.2).sub.xCH.sub.3 wherein x=0-22 and R.sup.IV represents CH.sub.2CH(OH)CH.sub.2 or (CH.sub.2)x- wherein x=0-22; R.sup.V and R.sup.VI represent independently from each other H or (CH.sub.2).sub.xCH.sub.3 wherein x=0-22; with the proviso that R represents keratin or a keratin hydrolysate if X represents C(O)O, which lead to improved structural reinforcement of keratin fibres and improved hair care, and which reduce or prevent colour washout in dyed hair.

The invention relates to a method for mending split ends of hair comprising contacting the hair with split ends with a composition comprising at least cationic polygalactomannan containing non-ionic hydroxyalkyl substituents and having a Brookfield RVT viscosity at 25? C. and 20 rpm greater than 700 mPa.Math.s, at a concentration of 1 pbw in water, for instance comprised between 700 and 1,200 mPa.Math.s.

A hair refreshing composition that accomplishes neutralizing and/or toning in 5 minutes and includes a color toning system with least one violet toned direct dye, and an acidic bonding restorative base that includes least one anionic surfactant including an isethionate surfactant, at least one ester including coco-caprylate/caprate, at least one cationic compound, at least one additional surfactant, and a cosmetically acceptable solvent that includes water. The composition confers the dual benefits of restoring hair texture and toning and/or neutralizing hair color, particularly in lightened or color lifted blonde hair in a formulation that is stable (retention of viscosity, bulk tone and efficacy of toning/neutralizing brassiness).

A method of combatting colour loss from a dyed material, the method comprising contacting the material with a composition comprising a polycarboxylic acid derived chelating agent.