Break Out of Your Hair Rut
Your Hair Color-opediaPermanent Color
Used to cover gray or to go from one shade to another (say, blond to brunet, or vice versa), permanent color contains ammonia and peroxide to deposit long-lasting pigments deep within the hair shaft. You'll need to touch up roots in four to six weeks.Semipermanent Color
Contains tiny molecules of dye that coat the hair's outer cuticle and rinse away after several shampoos. Since it contains no ammonia or peroxide, semipermanent color can only brighten or darken existing color, not change it, and is gentler on hair than other methods.Ammonia
Swells the hair's outer cuticle, allowing dye to penetrate.Peroxide
Permanently traps in color molecules.
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