COLORANTS DIRECTS AZOMETHINIQUES TRI-AROMATIQUES, COMPOSITION TINCTORIALE COMPRENANT AU MOINS UN TEL COLORANT, PROCEDE DE MISE EN ŒUVRE ET UTILISATION

摘要

The present invention relates to azomethine-type direct dyes having a triaromatic unit of formula (I) below: and also 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, in a medium suitable for dyeing, such direct dyes. Another subject of the present invention is a method for dyeing keratin fibres using said dye composition. Finally, the present invention also relates to precursors of these direct dyes.