Olaplex Blonde Enhancing Toning Shampoo No.4P strengthens, softens, and neutralises unwanted brassy, yellow tones for brighter, more manageable hairThis highly concentrated formula allows for customisable toning - the longer you treat, the brighter the end results you enjoy. This moisturising shampoo cleanses, tones, and repairs while keeping hair hydrated from roots to ends. The gentle sulphate-free formula creates a rich lather to neutralise brassiness and boost brightness after one use. Suitable for all blonde, lightened, and grey hair. Powered by Olaplex's patented Bond Building technology, it helps repair broken hair bonds and restore damageHow to Use: Apply to wet hair. Lather fully & let process 1-3 minutes. Then rinse thoroughly. For more intense toning, leave on up to 5 minutes.