professional red tones neutralizing shampoo for dark brown hair. Discover the new Serie Expert CHROMA CRÈME range, for color maintenance and treatment, like a pro! HOW TO USE : Apply evenly to wet hair. Emulsify. Leave on for at least 2 minutes, or longer depending on the degree of neutralization you desire. Rinse. Alternate with your usual shampoo. In case of contact with eyes, wash immediately with plenty of water.