Agent and method for coloring keratin fibers.

The colorants of keratin fibers (A), characterized in that contains (a) at least one hydrazone derivative of formula (I) or a physiologically acceptable thereof, wherein X is oxygen or sulfur salt; A is hydrogen, an acetyl group, a trifluoroacetyl group, a formyl group, an alkyl (C1-C6) alkylsulfonyl group or an arylsulfonyl group; R1 is a saturated or unsaturated alkyl group (C1-C12), an alkyl group (C1-C12) substituted with a halogen atom (F, Cl, Br, I), a hydroxy- (C1-C12), an aminoalkyl group (C1-C12), a (C1-C12) alkyl sulfonic acid group, a formyl group, a C (O) (C1-C12), a C (O) -phenyl group, a C (O) NH (C1-C12), a C (O) NH-phenyl, a substituted phenyl group or unsubstituted or a benzyl group; R2 and R3 may be the same or different and represent, independently, hydrogen, a halogen atom (F, Cl, Br, I), a saturated alkyl group (C1-C12) or unsaturated alkyl group (C1-C12 ) substituted with a halogen atom (F, Cl, Br, I), a hydroxy- (C1-C12), alkoxy (C1-C12), cyano, nitro, amino, an alkyl group (C1-C12 ) alkylamino, (C1-C12) dialkyl amino, a carboxylic acid, a C (O) O (C1-C12), a C (O) O-phenyl substituted or unsubstituted, a substituted phenyl group or unsubstituted or a naphthyl group, or R2 and R3 form, together with the rest of the molecule, a carbocyclic or heterocyclic system, saturated or unsaturated, substituted or unsubstituted ring; (B) at least one coupler substance known per se or a physiologically acceptable salt thereof; and (c) a persulfate salt as an oxidizing agent.