Patent ID: 7303591

Claim:
A dye composition comprising, in a medium that is suitable for dyeing keratin fibers, at least one mixed dye comprising at least two chromophores, wherein at least one of the chromophores is chosen from cyclic azine and (hetero)aromatic nitro compounds, optionally associated with at least one chromophore chosen from methine and carbonyl compounds, wherein the at least two chromophores are linked together via at least one linker that stops delocalization of the electrons of each of the chromophores; with the following exceptions: the dye composition is not a composition comprising a mixed dye comprising two chromophores, one of which is a benzene nitro compound and the other an anthraquinone or benzene nitro compound; wherein the two chromophores are connected by a nitrogen atom through a linker comprising an alkyl radical optionally interrupted by a nitrogen atom bearing one or two radicals chosen from hydrogen, C 1 -C 4 alkyl radicals, and C 1 -C 4 hydroxyalkyl radicals, and the dye composition does not comprise compounds of the following formulae: