Features of Color Treatment and Technology Development of Hair Dyeing Agents Applying Melanin Precursor

Abstract

Color treatment is a hair dying agent which can both treat and color hair. Unlike hair color, which mixes 2 agents before use, color treatment cannot lighten hair color by an application and change hair color greatly. But from its convenience and a sense of security, it has been attracting attention as an item which takes the place of hair color or supports the effect of it. This review describes dye stuffs and their characteristics used in general color treatment, as well as the coloring mechanism and agent characteristics. Additionally, the development and technology of a hair dying agent which contains dihydroxyindole, a black melanin precursor, and its characteristics are described.