Product Overview Cancel out unwanted yellow and brassy tones in your Blonde with the Kérastase Blond Absolu Bain Ultra Violet Shampoo 250ml. Working to deeply cleanse your hair directly from the root, removing excess oils and built up dirt without causing damage or preventing colour fading. Directions for use Lather into wet hair and leave for 2-5 minutes before rinsing out to achieve the best results. Use weekly as a second shampoo for when you want a deeper cleanse.