What kind of hair color is known to eco-fade over time with each wash?

Semi-permanent hair color is designed to gradually fade over time, typically lasting through several washes before completely disappearing. Unlike permanent hair color, which contains ammonia and developers to open the hair cuticle and infuse the color deep into the hair shaft, semi-permanent formulas are gentler and only coat the outer layer of the hair. This results in a more subtle and less long-lasting effect, perfect for those looking for a low-commitment color option.

The fading process of semi-permanent hair color is influenced by the hair's porosity, the conditioning agents in the formulation, and the frequency and method of washing. With each wash, the color molecules gradually wash away, leading to the eventual return to the hair’s original shade. This property makes semi-permanent color popular for enhancing natural colors or trying out new shades without the long-term commitment.

In contrast, permanent hair color remains in the hair until it grows out or is cut off, while temporary hair color typically lasts only until the next shampoo. Progressive hair color refers to products that gradually build up color with multiple applications. Each of these categories has distinct characteristics, but the key defining feature of semi-permanent hair color is its eco-fade quality over time with regular washing.