Pure Identity Peroxide is specifically designed for hair color and bleaching. The structural enhancing additives in the emulsion give maximum hair protection and perfect color effect. Peroxide is available in 5 strengths: 6 Vol. (1.9%), 10 Vol. (3%), 20 Vol. (6%), 30 Vol. (9%), and 40 Vol. (12%). The acid content of Peroxide is tailored to the alkalinity of the hair color.