Dyeing composition based on hydroxyindoline derivatives, process for dyeing keratinous fibres and new hydroxyindoline derivatives

摘要

The use of a hydroxyindoline derivative of formula (I), wherein R1 is hydrogen or C1-4 alkyl; R2 is hydrogen or C1-4 alkyl; OH and -OR2 are in positions 4, 5, 6 or 7, with the proviso that when they are in positions 5 and 6, R2 is alkyl; and acid addition salts thereof; for dyeing keratin-containing matter, particularly human keratin-containing matter, is described.