Philip Kingsley Pure Blonde Booster Colour Correcting Shampoo 250mlPure Blonde Booster Shampoo instantly neutralises brassiness, cooling warm tones to leave hair looking radiant and clarified. Our weekly use hydrating formula contains optimum levels of violet micro pigments, correcting yellow tones for that freshly coloured look. All hair will react differently, so test a small section of your lightest hair before first use. Wait at least two weeks after having hair coloured, bleached or permed before using.