Patent ID: 7651537

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 first coupler chosen from 6-chloro-2-methyl-5-aminophenol, and addition salts thereof; and at least one second coupler chosen from substituted meta-aminophenols of formula (II) below, and addition salts thereof: wherein: R 1 and R 2 , which may be identical or different, are each chosen from a hydrogen atom; an alkyl radical; a monohydroxyalkyl radical; a polyhydroxyalkyl radical; and a monoaminoalkyl radical; or R 1 and R 2 form, together with the nitrogen atom to which they are attached, a saturated or unsaturated, 5- to 7-membered cyclic group containing 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 is chosen, independently, from a halogen atom, an alkyl radical, an alkoxy radical, a monohydroxyalkyl radical, a polyhydroxyalkyl radical, a monohydroxyalkoxy radical, and a polyhydroxyalkoxy radical; n is an integer ranging from 0 to 4; with the provisos that: when n is equal to 0, then at least one of the radicals R 1 and R 2 is other than a hydrogen atom; when n is equal to 2 and R 3 is a methyl radical and a chlorine atom, respectively, in positions 2 and 6, and R 1 and R 2 do not simultaneously represent a hydrogen atom; it being understood that the at least one first oxidation base and the at least one first coupler are present in a mole ratio of less than 1.5, the at least one first oxidation base and the at least one second coupler are present in a mole ratio of greater than 1, and the molar amount of the at least one first oxidation base is greater than or equal to 2.5×10 −3 mol per 100 g of composition.