Process for oxidative dyeing of keratinous fibres

摘要

For the oxidative coloring of human hair, during the pre-penetration phase the molecules of at least one oxidative colorant intermediate product and the molecules of at least one compound to activate the color reaction penetrate into the hairs while no chemical oxidizing agent acts on them. After a given time span, at least one chemical oxidizing agent it applied in a development phase. The agents are packaged with the intermediate product in one container and the oxidizing agent in a second container.