Patent ID: 7833290

Claim:
A method for dyeing keratinous fibers, comprising treating said fibers with: i) at least one entity chosen from compound chosen from synthetic or natural compounds of formulae (I) and (II), their mesomeric forms, their stereoisomers, their addition salts with an acid or base that is cosmetically acceptable, and their hydrates: and wherein: represents a single or conjugated double carbon-carbon bond; X represents either: R 1 , R 2 , R 3 , R 4 , R 5 and R 6 , which are identical or different, are chosen from a hydrogen atom, a hydroxy group, an optionally substituted alkyl group, optionally substituted alkoxy, and an optionally substituted acyloxy group; ii) at least one metal salt, iii) hydrogen peroxide or at least one system which generates hydrogen peroxide, and iv) at least one (bi)carbonate.