Anyone with lightened blonde, gray, silver, or white hair — natural or color-treated — dealing with brassy or yellow discoloration, plus people maintaining toned extensions or wigs. It's a consumer at-home product, no professional application needed, though it's distributed through both salons and retail as a professional line.

What distinguishes this shampoo is the adjustable, two-lather method: a first lather cleanses, and a second, optional lather can be left on for a few minutes to intensify toning as needed, so the same bottle can do light maintenance on a quick wash day or a stronger brass-correction on days when yellow or gold tones are more visible.

Apply to wet hair, lather, and rinse. Apply a second lather; for additional brightening/toning, leave the second lather on for 3 to 5 minutes before rinsing thoroughly.

Pro: combines actual violet toning pigments with hydrolyzed protein, so it addresses brassiness and conditions in the same step. Pro: works across a wide range of situations — natural gray/silver, color-treated blonde, highlighted hair, extensions, and wigs.

Con: contains two sulfates (sodium laureth sulfate, sodium lauryl sulfate), which are more likely to feel drying or stripping than sulfate-free alternatives. Con: leaving the second lather on too long, or using it too frequently, can over-tone hair toward an ashy or purple cast if not monitored. Con: contains a paraben (methylparaben) and added fragrance.