American Crew recommends American Crew 15 volume Developer in order to produce optimal results for gray blending. Use in conjunction with American Crew Precision Blend Shades: Light, Medium Ash, Medium Natural and Dark. Ingredients Aqua (Water) (Eau), Hydrogen Peroxide, Cetearyl Alcohol, Amondimethicone, Cetrimonium Chloride, Trideceth-12, Cetyl Alcohol, Ceteareth-60, Ceteareth-23, Pentasodium Pentelate, Methylparaben, Phosphoric Acid, Sodium Stannate