Redken Acidic Bonding Concentrate Shampoo 300ml - fortifying shampoo for damaged hair. Ultra-concentrated formula shampoo to repair, nourish, protect and keep hair color bright. Transforms all hair types, even the most sensitized and treated ones. With Citric Acid and Bonding Care Complex to fortify weakened bonds and give hair strength and resistance, especially after in-salon bleaching or coloring services.