Pigment boost coppery. Enhances coppery highlights (suitable for bases dark chestnut to dark blonde) and prolongs color radiance. On natural, colored or highlighted hair. Directions for use- used exclusively in combination with subtil color lab masks. Do not mix with shampoo. Wear gloves. Add 5ml of color dose to 15ml of subtil color lab mask. Distribute through washed and towel-dried hair. Leave in for 5 min. Rinse.