American Crew Gray Shampoo is a toning shampoo formulated for men with gray or graying hair, designed to counteract the yellow, brassy cast that can build up from hard water minerals, environmental pollutants, and product residue. Violet and blue toning pigments (Basic Blue 7 and Basic Violet 14) work on a color-wheel principle, depositing a small amount of cool-toned pigment to offset yellow discoloration, while hydrolyzed milk protein helps condition hair that can otherwise feel dry or coarse as it grays.Part of American Crew's men's grooming range, it's designed to be worked in like a regular shampoo rather than used as a separate toning treatment. To use, wet hair thoroughly, massage a small amount into hair and scalp, and rinse well; repeat if a stronger toning effect is wanted.