Patent ID: 6916345

Claim:
A dye composition comprising, in a medium suitable for dyeing: at least one oxidation base, and at least one coupler chosen from 6-alkoxy-2,3-diaminopyridine derivatives of formula (I) and the addition salts thereof: wherein: R 4 is chosen from C 1 -C 4 alkyl radicals optionally substituted with at least one radical chosen from hydroxyl, C 1 -C 2 alkoxy and NR 7 R 8 radicals, wherein R 7 and R 8 , which may be identical or different, are each chosen from hydrogen and C 1 -C 4 alkyl, C 2 -C 6 (poly)hydroxyalkyl, C 2 -C 6 (poly)aminoalkyl and C 2 -C 6 aminohydroxyalkyl radicals; R 5 and R 6 form, together with the nitrogen atom to which they are attached, a carbon ring chosen from 5- to 8-membered rings, wherein at least one carbon atom of the 5- to 8-membered rings may be replaced with at least one entity chosen from an oxygen atom, an optionally substituted nitrogen atom, a sulphur atom, and an SO 2 group; at least one carbon atom of the 5- to 8-membered rings may, independently of each other, be substituted; and said 5- to 8-membered rings do not comprise a peroxide bond, a diazo radical or a nitroso radical.