Redken Acidic Color Gloss Sulfate-free Shampoo and Conditioner 300ml. Level up your color-care with a red carpet, glass-like shine using the Acidic Color Gloss Sulphate-Free Shampoo. This revolutionary innovation combines an advanced, pH-balancing formula and Acidic Shine Complex, so your clients’ color remains vibrant and with a professional-grade gloss after a single application. The Acidic Color Gloss Conditioner is a professional-grade, moisture-boosting formula that gives your clients color fresh vibrancy with a glossy, glass-like finish.