The Acidic Bonding Concentrate 5-Min Liquid Mask from Redken is an intensively nourishing hair mask that instantly strengthens the hair, provides long-lasting noticeable moisture and ensures improved hair condition - after just one application. The formula, enriched with citric acid and a highly concentrated bonding care complex, is based on the latest scientific findings within hair care research. The mask is suitable for all hair types and textures, making it the perfect conditioning all-rounder for anyone who wants moisturized, shiny, strengthened and easier to detangle hair - in just 5 minutes!Application: After shampooing, distribute into cleansed, wet hair from mid-lengths to ends. Leave on for 5 minutes. Then rinse thoroughly. The use of the mask is recommended once a week and in combination with the complete Acidic Bonding Concentrate series.