Peroxide breaks down the hair’s natural melanin, taking away the color and lightening it. It is used in hair dye because it also releases oxygen that helps the dye deposit the color.
Peroxide can dye hair because it can react chemically with the melanin in your hair. Peroxide is a form of bleach that oxidizes the melanin in the hair particles so that the melanin molecules become colorless. The result of that reaction is what you see, no hair color. The melanin is still there, only you can’t see it in its oxidized form.
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