Olaplex No.4p Bond Enhancer Toning Shampoo is a highly concentrated purple shampoo that cleanses, tones, and repairs while keeping hair hydrated from roots to ends. The sulfate-free formula creates a rich lather to neutralize brassiness and boost brightness after one use for all blonde, lightened, and grey hair.
 
For application, apply to wet hair. Lather fully and let process for 1-3 minutes. Rinse.