No.4P highly concentrated purple shampoo cleanses, tones and repairs while keeping hair hydrated from roots to ends. This sulfate free formula creates a rich lather to neutralise brassiness and boost brightness after one use. 

For: All blonde, lightened and grey hair. 

How: Apply to wet hair, lather fully and leave to process up to 5 minutes, rinse. 

When: 1-2 times a week or as often as needed to neutralise unwanted brassiness. 

Learn more about Olaplex Bond Building technology.