Abstract: The present invention relates to a composition and a method of levelling hair colour, especially lighter coloured hair 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. The first objective of the present invention is an aqueous composition for levelling hair colour comprising at least one fatty acid salt, preferably an in-situ formed ammonium salt, and one or more anionic surfactants at a total concentration between 5 and 30% by weight, calculated to total of the composition, and has a pH between 5 and 12. Furthermore, use of the composition for levelling hair colour and a method of levelling hair colour are disclosed.