| 摘要 |
Dyeing composition for keratinous fibres, especially for human hair, which contains, in a medium suitable for dyeing these fibres, at least one para oxidation dye precursor or at least one ortho oxidation dye precursor in combination with at least one heterocyclic coupler corresponding to the formula: <IMAGE> in which R1 denotes a hydrogen atom, a C1-C4 alkyl radical; R2 denotes a hydrogen atom, a C1-C4 lower alkyl radical, a carboxyl radical or an alkoxycarbonyl radical; R3 denotes a hydrogen or halogen atom, a C1-C4 lower alkyl radical, a carboxyl radical, an alkoxycarbonyl radical or a formyl radical; X denotes a hydrogen atom, a C1-C4 alkyl radical, a halogen atom, a C1-C4 alkoxy radical, an acetylamino or di(C1-C4 alkyl)aminomethyl group; at least one of the groups X, R1, R2 and R3 being other than hydrogen; as well as their salts. |
