Introducing Redkens Acidic Bonding Concentrate 5-Minute Mask. Get Bond Repair for up to 3x stronger hair, hydration u0026 strength repair after every use. This intensely nourishing and hydrating mask is targeted at repairing hair from the deepest levels of damage and formulated with 16% Citric Acid, small enough to enter hair fibres and known to strengthen hair and Conditioning Care Complex. This innovative bonding mask contains a high concentration of conditioning oils and cationic agents, offering up to 72 hours of ultra-hydration and 2x more shine. This quick and easy-to-use hair mask is perfect for all hair types and textures, including colour-treated hair without stripping hair colour.To use: Use as a complete system with the Acidic Bonding Concentrate Shampoo. After shampooing, apply to wet hair from mid-lengths to ends. Leave on for 5 minutes and rinse thoroughly. Use at least once per week or as often as needed.