Olaplex Blonde Enhancer Toning Shampoo No 4P 250mLHighly concentrated purple shampoo cleanses, tones, and repairs while keeping hair hydrated from roots to ends. Sulfate free formula creates a rich lather to neutralize brassiness and boost brightness after one use for all blonde, lightened, and grey hair. Scientifically Proven: 3x Brighter compared to top purple shampoos Directions: Apply to wet hair, lather fully, and let process. 2 3 times per week or as often as needed to neutralize unwanted