The Blacklight Neu:Blu Blonde Science Blue Shampoo gently cleanses while neutralizing unwanted brassy tones. Powered by NEU technology enriched with squalane and high-purity chromophores, it helps balance tones while delivering hydration and shine. Its gentle formula revitalizes blonde, light brown or lightened hair, leaving it bright, refreshed and beautifully balanced. Neutralizes unwanted brassy tones Gently cleanses without weighing hair down Enhances brightness and shine HOW TO USE Apply to wet hair and gently massage to create a rich lather. Leave on for a few minutes depending on the desired toning intensity, then rinse thoroughly. Repeat if necessary.