Pure Blonde Booster Shampoo instantly neutralizes brassy tones, cools warm tones and leaves hair looking radiant and clarified. The moisturizing formula for weekly use contains an optimal amount of violet micropigments that correct yellow tones and provide a fresh look.Application: Start by using your normal shampoo to ensure hair is clean and free from product build-up. Rinse well and apply Pure Blonde Booster Shampoo and massage gently into hair for 60 seconds. Rinse thoroughly. Follow with our Color Correcting Mask for optimal results. Use once a week. Every hair reacts differently, so test a small section of your lightest hair before the first application. Wait at least two weeks after coloring, bleaching or perming your hair before using.