What It Is Achieve your brightest + healthiest blonde while you wash. Bust Your Brass is now formulated with bond cure technology, vegan proteins, and plant butters to hydrate, repair, and strengthen damaged hair, while ultra-violet pigments tone brassy hues. What It Does Clinically proven to tone, hydrate, and repair hair for: 2.2x stronger hair after one use* 86% more repair after one use* 55% less breakage after one use* *when used as a system with Bust Your Brass Cool Blonde Repair Shampoo (sold separately)