Acid Color Sulfate-Free Shampoo gloss Enhance the shine of your red hair | Sulfate-free shampoo for color-treated and dull hair, formulated with an acid shine complex and technology PH advanced formula that deeply purifies and improves hair shine thanks to its formula with pH Acid that seals the cuticle and corrects shine for more vibrant color. Long-lasting, salon-quality protection at home. Restore the shine of colored hair and intensify its color with this sulfate-free acid shampoo.