Goldwell Elumen Prepare is a professional hair pre-treatment designed to acidify and optimize the electrical charge of bleached or highlighted hair before applying color. It ensures pigments adhere evenly, even on very damaged ends. Acidifies after bleaching and balances porosity Enhances intensity, shine, and longevity of Elumen color Optimizes pigment adhesion for uniform results HOW TO USE Spray evenly on clean, damp or towel-dried hair. Leave on for a few minutes. Towel dry completely or dry thoroughly depending on hair condition, then apply Elumen color directly without rinsing.