| abstract |
From the use of direct dyes, the nature of the interaction that binds the direct dye to keratin fibers and its color development from the surface and / or core of the fiber, for example, is involved in weak relative fixation with repeated shampoos. The resulting coloration is a primary or semi-permanent coloration. In addition, these fiber dyeing interactions may create difficulties during use, particularly with respect to dye incorporation in the fiber, and may lead to poor uniformity of coloration and / or color change. The purpose is to solve these problems. By replacing a cationic monochromogenic hydrazone dye with one or more cationic groups, the affinity of the dye and its fixation can be improved, even for damaged hair, with respect to light or shampooing. It was discovered that [Selection figure] None |