Compositions and processes for dyeing keratin fibers with an oxidation base, a coupler, a cationic direct dye, and an oxidizing agent

A ready-to-use composition for the oxidation dyeing of keratin fibers, comprising, in a medium suitable for dyeing:

• at least one oxidation base,
• at least one coupler selected from meta-aminophenols of formula (I), or the acid-addition salts thereof:
• ##STR10## in which:
• R.sub.1 represents a hydrogen atom or a C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 monohydroxyalkyl or C.sub.2 -C.sub.4 polyhydroxyalkyl radical,
• R.sub.2 represents a hydrogen atom, a C.sub.1 -C.sub.4 alkyl or C.sub.1 -C.sub.4 alkoxy radical or a halogen atom,
• R.sub.3 represents a C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, C.sub.1 -C.sub.4 monohydroxyalkyl, C.sub.2 -C.sub.4 polyhydroxyalkyl, C.sub.1 -C.sub.4 mono-hydroxyalkoxy or C.sub.2 -C.sub.4 polyhydroxyalkoxy radical,
• at least one cationic direct dye selected from compounds of formula (II):
• ##STR11## in which:
• D independently represents a nitrogen atom or a --CH group,
• R.sub.4 and R.sub.5 each independently represents a hydrogen atom;
• a C.sub.1 -C.sub.4 alkyl radical which may be substituted with a --CN, --OH or --NH.sub.2 radical or form, with a carbon atom of the benzene ring, a heterocycle which is optionally oxygenated or nitrogenous, which may be substituted with one or more C.sub.1 -C.sub.4 alkyl radicals;
• or a 4'-aminophenyl radical,
• R.sub.6 represents a hydrogen or halogen atom, or a C.sub.1 -C.sub.4 alkoxy or acetyloxy radical,
• X.sup.- represents an anion selected from chloride, methylsulphate or acetate, and
• A represents a group selected from the following structures:
• ##STR12## in which:
• R.sub.7 represents a C.sub.1 -C.sub.4 alkyl radical which may be substituted with a hydroxyl radical, and
• R.sub.8 represents a C.sub.1 -C.sub.4 alkoxy radical,
• with the proviso that when D represents --CH, A represents A.sub.4 or A.sub.13 and R.sub.6 is other than an alkoxy radical, then R.sub.4 and R.sub.5 do not simultaneously denote a hydrogen atom;
• and
• at least one oxidizing agent.