theorganicsolutionpressImage: theorganicsolutionpressHairbleachis a chemicalreactionbetween melanin (the material in hairthat gives it color) and hydrogen peroxide. Chemical Reactions in Cosmetic Science - Chemists Corner Is this answer helpful?Thanks!Give more feedbackThanks!How can it be improved?How can the answer be improved?Tell us how Hair Color Chemistry: How Hair Coloring Works Jul 14, 2019Bleach is used to lighten people's hair. The bleach reacts with the melanin in the hair, removing the color through an irreversible chemical reaction. The bleach oxidizes the melanin molecule. The melanin is still present, but the oxidized molecule is colorless. However, bleached hair tends to have a pale yellow tint. The yellow color is the natural color of keratin, the structural protein in hair. What Exactly Does Bleach Do to Your Hair It reacts with the melanin (the part responsible for the color tones in your natural hair) in the hair, and removes the color in an irreversible chemical reaction. The bleach oxidizes the melanin molecule. Although the melanin is still present, the oxidized molecule is colorless. Hair bleach tends to leave a yellowish tint on the hair at first.