Connecticut Hairdresser Licensure Practice Exam

Bleach is specifically formulated to lighten the natural pigment of the hair. It works by breaking down the melanin in the hair, which allows the underlying lighter pigments to become visible. This chemical process is essential for achieving a lighter hair color, especially when going several shades lighter than the natural color or when creating highlights.

Permanent color can lighten hair but is primarily designed to deposit color into the hair, whereas demi-permanent color will not significantly lighten hair. Temporary color simply coats the hair without making any significant structural changes and typically washes out after a few shampoos. Thus, while all these types of color can alter hair appearance, bleach is uniquely effective for the purpose of lightening.