Dye composition, useful for coloring of human keratin fiber, preferably hair, comprises direct ac

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The present invention has as an aim of the compositions useful for the human keratinous fibre colouring, including/understanding in a medium cosmétiquement acceptable, one or more acid dyes and one or more compounds of formula (1) following : HS-A-COOX, in which X represents a hydrogen atom, an alkaline ion, an alkaline-earth ion or an ion resulting from organic amines; Has represents a radical alkylene, linear or ramified, out of Cl-C6 possibly carrying a grouping amino, méthylcarbonylamino. It also relates to a process of colouring implementing it as well as a suitable device multi-compartments.