This Infuse My. Colour Cobalt Shampoo is designed to maintain ash tones in brown hair and add sky blue and minty tones in blonde hair. Cobalt is particularly effective for preserving the cool tones in dark ash blondes and browns. It helps to fight colour fade, refreshes, revives, and tones coloured hair. The formula is 100% vegan and contains no silicones, sulphates, or parabens. Best for maintaining ash in browns.