The present invention relates to an aqueous composition and a method of levelling hair colour especially the hair lighter coloured or including lightened streaks or bleached streaks or bleached as a whole and after certain period of time contrast - difference in colour - between the re-growth and formerly lightened parts is clearly visible. Compositions comprising at least one fatty acid salt, preferably an in-situ formed ammonium or substituted ammonium salt, and one or more cationic or cationizable surfactants with the general structure wherein R4 is a saturated or unsaturated, straight or branched alkyl group with 8 to 24 C atoms, R5 is a straight or branched alkyl group with 1 to 4 C atoms, A is a group selected from O, and B is selected from wherein R6 and R7 are the same or different is H or an alkyl with 1 to 4 C atoms, hydroxyl alkyl with 1 to 4 C atoms and di hydroxyl alkyl with 2 to 4 C atoms, R8, and R9 are the same or different, an alkyl with 1 to 4 C atoms, hydroxyl alkyl with 1 to 4 C atoms and di hydroxyl alkyl with 2 to 4 C atoms, Rio is an alkyl with 1 to 4 C atoms, hydroxyl alkyl with 1 to 4 C atoms or di hydroxyl alkyl with 2 to 4 C atoms and wherein R4, A and R5 have the above meaning and X is chloride, bromide, methosulfate, or a quaternary ammonium surfactant according to the general formula where R11 is a saturated or unsaturated, branched or non-branched alkyl chain with 8-24 C atoms and R12 is unsaturated or saturated, branched or non-branched alkyl chain with 1 - 24 C atoms and R13 and R14 are lower alkyl chain with 1 to 4 carbon atoms which may be substituted with one or more hydroxyl groups, and X is anion such as chloride, bromide, methosulfate.Linvention concerne une composition et un procédé dégalisation de la couleur des cheveux, notamment les cheveux éclaircis ou comportant des mèches éclaircies ou décolorées, ou des cheveux intégralement décolorés présentant, après une certaine période, un contraste/une différence de couleur très vi
