The invention relates to a composition for dyeing keratinous fibres, in
particular human keratinous fibers such as hair, comprising, in an
appropriate dyeing medium, at least one cationic direct dye of a given
formula, and which is characterized in that it contains, in addition, at
least one anionic surfactant chosen from the group consisting of acyl
isethionates, acyl taurates, sulphosuccinates, acyl sarcosinates, acyl
glutamates, polyoxyalkylenated ether carboxylic acids and their salts,
fatty glucamide sulphates, alkyl galactoside uronates, anionic derivatives
of alkyl polyglucosides and mixtures thereof.
The invention also relates to the dyeing methods and devices using it.