In order to precisely freeze color pigments, Schwarzkopf Professional BC Clean Performance Color Freeze Shampoo 250ml gently cleanses hair to its ideal pH 4.5 level. This shampoo is designed specifically for color-treated hair, gently but thoroughly cleaning it and restoring its ideal pH. It keeps color from fading and supports the integrity of hair, giving hair a vibrant, healthy appearance. Which features and advantages come with the 250ml Schwarzkopf Professional BC Clean Performance Color Freeze Shampoo? Colored hair is cleansed gently but effectively. restores hair to its ideal pH level. keeps color from fading. protects the structure of hair. What is the purpose of the 250ml Schwarzkopf Professional BC Clean Performance Color Freeze Shampoo? This shampoo is ideal for people who wear color.