Get the results you want with Redken Shades EQ Gloss Processing Solution . 33.8 oz. This product is recommended for professional use only. It’s formulated to be mixed with Shades EQ Equalizing Conditioning Color Gloss (sold separately). This product’s acidity produces proper pH and stabilizes viscosity. It ensures that tone . depth and color durability are achieved without any lift of the natural pigment. This Redken gloss processing solution comes in a generous size for multi-user settings. Follow up treatment with Color Extend Shampoo and Conditioner (sold separately) for best results.