What is the typical reaction of hair to hydrogen peroxide during coloring?

The typical reaction of hair to hydrogen peroxide during coloring is that it oxidizes the natural hair pigment. Hydrogen peroxide acts as a bleaching agent, breaking down the melanin, which is the natural pigment found in hair. This oxidation process lightens the hair color by reducing the presence of the darker pigments, effectively allowing for brighter or more vibrant shades to be applied afterward.

Hydrogen peroxide is often a key ingredient in hair coloring and lightening products because of its ability to penetrate the hair shaft and alter the pigment composition. This property is particularly important in achieving the desired results in hair dyeing, as it forms the basis for many coloring techniques.

While hydrogen peroxide can also lead to increased dryness or brittleness in hair if used excessively or without proper aftercare, the primary function in the context of hair coloring is to oxidize the natural pigment, allowing for the transformation of hair color.