Apply to hair that has been shampooed with madder root shampoo. Comb through. Leave on 2–5 minutes. For deeper color deposit and conditioning, leave on longer. Use every 2–3 shampoos for consistent, lasting color enhancement. Please note, chemically treated hair will take color more intensely. Consult your stylist or colorist. Not recommended for blonde or grey shades of hair. Product should be promptly rinsed to avoid staining to hands, clothing or bathroom fixtures.