Composition comprising at least one 1,8-dihydroxynaphthalene derivative and at least one basifying agent other than aqueous ammonia, process for dyeing keratin fibers using the composition
Procedure for dyeing keratin fibers, by treating said fibers with: - i) one or more derivatives of 1,8-dihydroxynaphthalene of formula (I): ** Formula ** its inorganic or organic acids or bases, its optical isomers, isomers geometric, its tautomers and / or its solvates such as hydrates； formula (I) in which: * R1 and R6 independently represent one another: - a hydrogen atom, - a C1-C4 alkyl radical which may be functionalized with one or more hydroxyl or (C1-C4) alkoxy radicals - carbonyl, - a carboxylic radical -CO2H, - an alkoxy (C1-C4) -carbonyl radical, - an alkyl (C1-C4) -carbonyl radical which may be functionalized with a (C1-C4) alkyl-carbonyl radical or a radical (C1-C4) alkoxy -carbonyl, - a C1-C4 alkoxy radical, - a carboxaldehyde radical -CHO, - a sulfonic radical -SO3H； * R2 and R5 represent, independently of each other: - a hydrogen atom, - a hydroxyl radical, - a C1-C4 alkyl radical which may be functionalized with one or more hydroxyl or (C1-C4) alkoxy-carbonyl radicals, - a carboxylic radical -CO2H, - an alkoxy (C1-C4) -carbonyl radical, - an alkyl (C1-C4) -carbonyl radical which may be functionalized with a hydroxyl radical, - a C1-C4 alkoxy radical, - a carboxaldehyde radical -CHO, - a sulfonic radical -SO3H； * R3 and R4 represent, independently of one another: - a hydrogen atom, * R1 and R2 can form, together with the carbon atoms to which they are attached, a heterocycle optionally substituted with an oxo group, such as pyrone, particularly 4-pyrone, which may be functionalized with one or two C1-C4 alkyl radicals:, representing R and R ', which may be identical or different, a hydrogen atom or a C1-C4 alkyl radical； preferably, R and R 'represent a hydrogen atom or R' represents a hydrogen atom and R represents a C1-C4 alkyl radical； and - ii) one or more basifying agents other than aqueous ammonia； it being understood that: - the derivative or derivatives of 1,8-dihydroxynaphthalene of formula (I) and the agent or basifying agents can be appli
