Product Overview Protect your Blonde from brassy, yellow tones with the Kérastase Blond Absolu Masque Ultra Violet Treatment 200ml. Created to eliminate warm tones whilst protecting the condition of your locks. Enriched with Hyaluronic Acid and Edelweiss Flower extracts, rebuild strength back to weak and brittle hair. Directions for use Apply onto the mid lengths to ends of towel dried hair at the end of your hair wash routine. Leave on for 5 minutes before rinsing out. Use once a week to achieve the best results.