Olaplex No. 4P Blonde Enhancer Purple Toning Shampoo is a highly concentrated purple shampoo designed to cleanse, tone, and repair hair in a single step. Ideal for blonde, lightened, and grey hair, its sulfate-free formula creates a luxurious lather that removes unwanted yellow tones, boosts brightness, and leaves hair soft, hydrated, and visibly healthier from roots to ends.