Neutralises, protects, enhancesViolet Ash Ultra Concentrated Pigment neutralises unwanted yellow tones and protects hair colour from damage caused by blue light. Vegan formula.How To UseFor use with shampoo: pour the contents of the entire bottle into shampoo bottle and shake for 15 seconds to mix thoroughly. For use as a hair mask: pour the contents of the entire bottle into the hair mask jar and mix until the colour is fully blended.