The Science of Color: How Chemical Dyeing Processes Transform Hair Structure

This study explores the chemical processes involved in hair dyeing, focusing on how oxidative and non-oxidative dyes affect hair structure. It highlights that oxidative dyes, using hydrogen peroxide and alkalising agents, modify keratin, lift the cuticle, and increase porosity, while semi-permanent and direct dyes cause less structural damage. The research also discusses new technologies like bond-repair additives and ammonia-free systems that aim to protect hair integrity while delivering effective color results, offering a biochemical basis for achieving both aesthetic and hair health goals.