Sealed / Unopened Bottle of Olaplex Nº.4P BLONDE ENHANCER™ TONING SHAMPOO. 8.5 oz bottle The Nº.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.