Process for treating keratin fibres using a carnitine salt or a carnitine derivative

A method for treating keratin fibers, comprising:

• a) applying to the keratin fibers at least one compound D chosen from compounds of formula (I), solvates thereof, or mixtures thereof:
• wherein in formula (I):
• R1, R2 and R3 are independently chosen from a (hydroxy)(C1-C4)alkyl group;
• R4 is chosen from a hydrogen atom, a (C1-C4)alkyl group, or a group —C(O)R, wherein R is a (C1-C3)alkyl group;
• R5 is chosen from a hydrogen atom, a (C1-C4)alkyl group, an alkali metal, or an alkaline-earth metal;
• An− represents an organic anion;
• x is a stoichiometric coefficient chosen to allow the electrical neutrality of the compound of formula (I);
• b) applying to the keratin fibers a composition (B) comprising:
• i) at least one chemical oxidizing agent chosen from hydrogen peroxide, hydrogen peroxide-generating systems other than peroxygenated salts, or mixtures thereof;
• ii) at least one compound chosen from a carbonate, a carbonate-generating system, a bicarbonate, a bicarbonate-generating system, or mixtures thereof;
• and
• iii) at least one silicate;
• wherein the at least one compound (D) and composition (B) are applied simultaneously or sequentially to the keratin fibers.

A multi-compartment device comprising:

• a first compartment comprising a composition (B1), wherein composition (B1) comprises at least one chemical oxidizing agent i) chosen from hydrogen peroxide, hydrogen peroxide-generating systems other than peroxygenated salts, or mixtures thereof;
• a second compartment comprising a composition (B2), wherein composition (B2) comprises:
• at least one compound ii) chosen from a carbonate, a carbonate-generating system, a bicarbonate, a bicarbonate-generating system, or mixtures thereof;
• at least one silicate iii);
• and
• optionally at least one coloring agent iv);
• and
• optionally a third compartment comprising a composition (B3), wherein composition (B3) comprises the at least one coloring agent iv);
• and
• optionally a fourth compartment comprising a composition (A);
• and
• optionally a fifth compartment comprising a composition (C);
• wherein at least one of composition (B1), composition (B2), composition (B3), composition (A) or composition (C) comprises at least one compound D chosen from compounds of formula (I), solvates thereof, or mixtures thereof:
• wherein in formula (I):
• R1, R2 and R3 are independently chosen from a (hydroxy)(C1-C4)alkyl group;
• R4 is chosen from a hydrogen atom, a (C1-C4)alkyl group, or a group —C(O)R, wherein R is a (C1-C3)alkyl group;
• R5 is chosen from a hydrogen atom, a (C1-C4)alkyl group, an alkali metal, or an alkaline-earth metal;
• An− represents an organic anion;
• x is a stoichiometric coefficient chosen to allow the electrical neutrality of the compound of formula (I).