Composition for dyeing keratin fibres, comprising, in a suitable medium: • at least one first oxidation base chosen from 2,3-diamino-6,7-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-one, and the addition salts thereof; • at least one first coupler chosen from 6-chloro-2-methyl-5-aminophenol, and the addition salts thereof; and • at least one second coupler chosen from the substituted meta-aminophenols of formula below, and the addition salts thereof: in which: R 1 and R 2, which may be identical or different, represent a hydrogen atom; an alkyl radical; a monohydroxyalkyl radical; a polyhydroxyalkyl radical; 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 one or more heteroatoms, which may be unsubstituted or substituted with one or more radicals chosen from carboxyl, carboxamido, hydroxyl, amino, monoalkylamino and dialkylamino radicals, and alkyl radicals optionally substituted with one or more hydroxyl, amino, monoalkylamino or dialkylamino radicals; R 3 represent, independently of each other, a halogen atom; an alkyl radical; an alkoxy radical; a monohydroxyalkyl radical; a polyhydroxyalkyl radical; a monohydroxyalkoxy radical; a polyhydroxyalkoxy radical; n is an integer between 0 and 4; with the proviso 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 represent a methyl radical and a chlorine atom, respectively, in positions 2 and 6, then R 1 and R 2 do not simultaneously represent a hydrogen atom; it being understood that the first oxidation base/first coupler mole ratio is less than 1.5, the first oxidation base/second coupler mole ratio is greater than 1 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. • at least one first oxidation base chosen from 2,3-diamino-6,7-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-one, and the addition salts thereof; • at least one first coupler chosen from 6-chloro-2-methyl-5-aminophenol, and the addition salts thereof; and • at least one second coupler chosen from the substituted meta-aminophenols of formula below, and the addition salts thereof: R 1 and R 2, which may be identical or different, represent a hydrogen atom; an alkyl radical; a monohydroxyalkyl radical; a polyhydroxyalkyl radical; 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 one or more heteroatoms, which may be unsubstituted or substituted with one or more radicals chosen from carboxyl, carboxamido, hydroxyl, amino, monoalkylamino and dialkylamino radicals, and alkyl radicals optionally substituted with one or more hydroxyl, amino, monoalkylamino or dialkylamino radicals; R 3 represent, independently of each other, a halogen atom; an alkyl radical; an alkoxy radical; a monohydroxyalkyl radical; a polyhydroxyalkyl radical; a monohydroxyalkoxy radical; a polyhydroxyalkoxy radical; n is an integer between 0 and 4; 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 represent a methyl radical and a chlorine atom, respectively, in positions 2 and 6, then R 1 and R 2 do not simultaneously represent a hydrogen atom;