Disclosed are thiol dyes of formula (I), wherein R1, R2, R3, R4 and R5 independently from each other are hydrogen unsubstituted or substituted, straight-chain or branched, monocyclic or polycyclic, interrupted or uninterrupted C1-C14alkyl C2-C14alkenyl C6-C10aryl C6-C10aryl-C1-C10alkyl or C5-C10alkyl(C5-C10aryl) A is a residue of an organic dye and Y1 is the direct bond C1C10alkylene C5-C10cycloalkylene C5-C12arylene or C5-C12arylene-(C1-C10alkylene). The compounds are used to dye hair with or without reducing agents. Furthermore, the present invention relates to compositions comprising thiol dyes of formula (I) and to process for the preparation of theses compounds.
