The present invention relates to quinone direct dyes of formula (I) below organic or mineral acid or base salts thereof tautomeric forms optical isomers or geometrical isomers thereof and/or solvates thereof: and also to the use thereof for dyeing keratin fibres in particular human keratin fibres such as the hair. The invention also relates to a composition for dyeing keratin fibres comprising such direct dyes in a suitable dyeing medium. Similarly a subject of the present invention is a process for dyeing keratin fibres using the said dye composition.
