Patent ID: 7182791

Claim:
A method for dyeing keratin material comprising: applying to the keratin material a composition comprising, in a medium that is suitable for dyeing, at least one ninhydrin compound of formula (I) wherein X is chosen from sulphur atoms and selenium atoms, and R is chosen from hydrogen, linear and branched C 1 –C 9 alkyl groups, cyano groups, halo groups, C 1 –C 6 alkoxy groups, amino groups, mono- and di(C 1 –C 6 alkyl)amino groups, mono- and dihydroxy(C 1 –C 6 alkyl)amino groups, tri(C 1 –C 6 alkyl)ammonio groups, imidazolyl groups, pyridinyl groups, thio groups, (C 1 –C 6 alkyl)thio groups, thio(C 1 –C 6 alkyl) groups, (C 1 –C 6 alkyl)carbonyl groups, hydrogenocarbonyl groups, hydroxycarbonyl groups, (C 1 –C 6 alkoxy)carbonyl groups, nitro groups, sulphonato groups, and corresponding protonated groups, and aromatic groups comprising at least 5 members, wherein the aromatic groups are chosen from monocyclic and polycyclic groups, fused or non-fused rings, optionally comprising at least one heteroatom chosen from nitrogen, oxygen, sulphur and phosphorus.