TINCTORIAL COMPOSITION FOR KERATINOUS FIBRES CONTAINING OXIDATION DYE PRECURSORS AND AMINOINDOLE COUPLERS, METHODS FOR DYEING USING THIS COMPOSITIONS

摘要

The present invention is a dyeing method using this new substance and foreign substances as a chemical for dyeing keratin fibers containing an oxidized dye precursor and an aminoindole linking group.;Keratin fibers, in particular human keratin fibers, especially for hair dyeing, which is used for dyeing hair, in a solvent medium suitable for dyeing the fibers, at least one para-oxidized precursor or at least one ortho oxidized dye precursor and the following structural formula (I) Characterized in that at least one heterocyclic linkage is included:;here:;R ₁ and R ₃ may be the same or different and are hydrogen, a C ₁ -C ₄ alkyl group; R ₂ is hydrogen, a C ₁ -C ₄ alkyl group, a carboxyl group or an alkoxycarbonyl group; At least one of the R ₂ or R ₃ radicals is hydrogen; R ₄ is hydrogen, C ₁ -C ₄ alkyl or C ₁ -C ₄ hydroxyalkyl or C ₂ -C ₄ polyhydroxyalkyl group; The NHR ₄ group is in position 4,6 or 7 in the benzene ring and salts thereof.