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hair coloring

Hair colorants take the form of four basic approaches: natural colorants, temporary colorants, lightening and "permanent" colorants. Natural pigments generally work by coating the hair shaft with color sometimes lasting for several shampoos. Temporary colors either use acidic dyes and peroxide or ammonia. Eventually, these products wash out. To lighten hair, bleach is employed with mixed effects and duration. Hydrogen peroxide is also commonly used. Most permanent hair colors employ a two-step process which first removes the original color and then infuses a new color. Read more about hair color.