| 摘要 |
<p>Process for dyeing keratinous fibres, characterised in that at least one composition (A) containing, in a medium suitable for dyeing, at least one indole derivative corresponding to the final formula: <IMAGE> in which: R1 denotes a hydrogen atom or a C1-C4 alkyl radical; R2 or R3, which may be identical or different, denote a hydrogen atom, a C1-C4 lower alkyl radical, a carboxyl radical or an alkoxycarbonyl radical; and ZO denotes a hydroxyl or protected hydroxyl radical, is applied on these fibres, the application of the composition (A) being followed by the application of a composition (B) consisting of an aqueous composition possessing an acid pH, the composition (A) or the composition (B) containing at least one nitrite.</p> |
