Permanent Dyes
Permanent dyes are hair color products that use chemical ingredients to penetrate the hair cuticle and bond with the hair shaft, resulting in long-lasting color that does not wash out easily. These dyes typically contain ammonia and hydrogen peroxide to lift the hair's natural color and deposit the new color. Permanent dyes are designed to provide full coverage of gray hair and can last for several weeks to months before needing to be touched up.