摘要：

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: ##STR1## in which Rdenotes hydrogen or C-Calkyl; Rand R, which may be identical or different, denote hydrogen, C-Calkyl, carboxyl or alkoxycarbonyl; and X denotes hydrogen, C-Calkyl, C-Calkoxy, halogen or acetyl-amino; at least one of the groups X, R, Rand Rbeing other than hydrogen; as well as the salts of these compounds;

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