| abstract |
Method for dyeing keratinous fibres, in particular human keratinous fibres such as hair, characterized in that a composition containing, in a medium appropriate for dyeing, at least one 4-hydroxyindole derivative of formula: <IMAGE> (I) in which R1 denotes hydrogen or C1-C4 alkyl; R2 and R3, which may be identical or different, denote hydrogen, C1-C4 alkyl, carboxyl or alkoxycarbonyl; and X denotes hydrogen, C1-C4 alkyl, C1-C18 alkoxy, halogen or acetyl-amino; at least one of the groups X, R1, R2 and R3 being other than hydrogen; as well as the salts of these compounds; at least one oxidation dye precursor; and at least one oxidizing agent; is applied to said fibres, the pH of the composition applied to the fibres being less than 7. |