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The N.4P Blonde Enhancer Toning Shampoo, infused with patented OLAPLEX Bond Building Technology, is a highly concentrated purple shampoo that cleanses, tones and repairs with a sulfate-free formula that neutralizes brassiness and boosts brightness after just one use. Neutralizes unwanted brassiness and yellow tones. Cleanses without stripping and drying. Sulfate free and PH Balanced. Flexible timing allows for a more customizable end result. Scientifically proven: 3x brighter*