Question

what is the chemistry involved in hair dye​

Answer 1

Oxidative hair dyes contain the oxidizer hydrogen peroxide and a dye intermediate such as paraphenylene-diamine (PPD), resorcinol, and aminophenol. PPD is an aromatic compound, widely used in almost all hair-coloring formulations, because oxidation of this substance with couplers produces colored reaction products.

Answer 2

Answer:

Hair dye is made of many different chemical things we call compounds. (By the way, water is a chemical compound.) Many permanent hair dyes use three components: ammonia (NH3), hydrogen peroxide (H2O2), and p-phenylenediamine or something very similar to it.