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Many beauty products, such as highlighting shampoos, hair dyes and bleaching agents contain hydrogen peroxide. Many people rely on hair-lightening products to change the color of their hair.
Peroxide or H202 is a combination of hydrogen and oxygen and, in lower concentrations, is generally considered safe for a number of applications, one of which is hair lightening.
Hair is comprised of keratin. Hair color is determined by quantities of eumelanine (brown to black shades) and phaemelanine (blond, ginger, and red shades). The absence of either melanin shows in grey or white hair.

