ABSTRACT
The so-called “oxidation” dyes are the only dyes capable of giving permanent hair color in an infinite variety of shades and a perfect coverage of white hair. The formulation of 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:
Nowadays the permanent dyes are by far the most frequently used hair coloring products and hold the dominant share of the market.
