Olaplex No.4P Blonde Enhancer Toning Shampoo is a specialized purple shampoo designed to tone, brighten and repair blonde, lightened and grey hair. It combines Olaplex's patented bond-building technology with purple pigments to neutralize unwanted brassy tones while strengthening damaged hair. Key features: • Tones and brightens blonde, lightened and grey hair • Contains bond-building technology to repair damage • Neutralizes brassy and yellow tones • Hydrates and strengthens hair • Purple-tinted formula • Sulfate-free formula For best results, apply to wet hair and massage into a lather, focusing on areas that need toning. Leave on for 1-3 minutes before rinsing thoroughly. The amount of time left on hair will affect the level of toning - longer application will result in more intense toning. Use 1-3 times per week depending on desired level of toning. Can be alternated with regular Olaplex No.4 Bond Maintenance Shampoo.