ABSTRACT
The so-called ‘‘oxidation’’ dyes are the only dyes capable of giving permanent hair color in an infinite variety of shades and aperfect coverage ofwhite hair. The formulationof almost all permanent hair dye products uses oxidation dyes. In this class are all the dyes and color shampoos used in hair salons or for home use, offering the following possibilities:
Cover-up of white hair in a variety of shades, in particular, the natural shades, Simultaneous bleaching and dyeing to obtain intense highlights, Shading after lightening in all possible tones, Sufficient durability so that the user only requires one application a month.
