Maintains ash-toned color and enhances others Leaves hair shiny with no residue Tones down brassiness No patch test required Shimmer Lights Shampoo is an award-winning, protein-enriched color-enhancing shampoo tones down brassiness on blonde or gray hair. Shimmer Lights refreshes faded highlights, removes the dull yellow in gray hair and leaves hair shiny without residue - and it can be used on natural or color-treated hair.