Schwarzkopf Supreme Keratin is a line that consists of five steps. Each step has its own effect that contributes to a healthy coupe. Schwarzkopf Supreme Keratin Deep Clarifying Shampoo is step one in this line. It is a shampoo that cleanses the hair and removes residue. The pH-value of 7.5 will open the hair shaft so that the hair is prepared for the next treatment.