Hair treatment methods

摘要

A hair treatment method comprising the steps of:
(a) optionally bleaching hair by applying a bleaching composition comprising from ammonium carbonate or a divalent metal cyanate and a source of hydrogen peroxide;
(b) dyeing the hair by applying a colouring composition comprising a sulphur-containing nucleophile and a dye compound selected from a dye class other than the class of reactive dyes; and
(d) removing colour from the hair by applying a colour removal composition comprising a sulfur-containing nucleophile or a precursor thereof.