Patent ID: 7651536

Claim:
A composition for dyeing keratin fibers, comprising, in a medium suitable for dyeing: at least one first oxidation base chosen from 2,3-diamino-6,7-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-one and addition salts thereof; at least one second oxidation base chosen from para-phenylenediamine, para-tolylenediamine, and addition salts thereof; and at least one first coupler chosen from substituted meta-aminophenols of formula (II) and addition salts thereof: wherein: R 1 and R 2 , which may be identical or different, are chosen from hydrogen; alkyl radicals; monohydroxyalkyl radicals; polyhydroxyalkyl radicals; and monoaminoalkyl radicals; or R 1 and R 2 may form, together with the nitrogen atom to which they are attached, a saturated or unsaturated, 5- to 7-membered cyclic group comprising at least one heteroatom, which may be unsubstituted or substituted with at least one radical chosen from carboxyl, carboxamido, hydroxyl, amino, monoalkylamino, and dialkylamino radicals, and alkyl radicals optionally substituted with at least one radical chosen from hydroxyl, amino, monoalkylamino, and dialkylamino radicals; R 3 , which may be identical or different, are chosen from halogen atoms; alkyl radicals; alkoxy radicals; monohydroxyalkyl radicals; polyhydroxyalkyl radicals; monohydroxyalkoxy radicals; and polyhydroxyalkoxy radicals; n is an integer ranging from 0 to 4; with the proviso that when n is equal to 0, then at least one of the radicals R 1 and R 2 is not hydrogen; wherein the at least one first coupler and the at least one first oxidation base are present in a mole ratio of greater than 1, the at least one first oxidation base and the second oxidation base are present in a mole ratio ranging from 0.5 to 1.5, and the molar amount of the first oxidation base is greater than or equal to 2.5×10 −3 mol per 100 g of composition.