The Acidic Color Gloss Conditioner is a moisture-boosting formula that works to give your hair fresh vibrancy and a glossy finish with +76% glass-like shine*. Citric Acid works by restrengthening the hair back to its healthiest pH , sealing in the cuticle, so your colour is locked in and protected from external aggressors that contribute to colour fade. The conditioner's ultra-nourishing properties smooth each strand from root to tip, helping hair feel hydrated and nourished for up to 72 hours after a single use**. With Redken's Game-Changing Acidic Shine Complex, you can now level up your colour-care by activating a professional-grade gloss at home. Formulated with a blend of amino acids and conditioning agents, the complex works by depositing glossing molecules across the hair for mirror-like shine. With every application achieve shine that not only looks but feel healthy. *when using full-system. **based on consumer test - acidic color gloss system of shampoo & conditioner.