This product is designed to enhance the vibrancy and longevity of Elumen on hair that has been bleached or highlighted. It works by opening the hair cuticles, promoting a more balanced color distribution and a healthier appearance. Elumen, from Goldwell, is a hair dye that brings forth a radiant inner glow, providing stunning and unmatched outcomes: Brilliant and radiant color effects. Exceptional longevity. Lustrous and healthy hair. Even after ten washes, the color stays vivid.