Redken's Color Extend Magnetics Shampoo gently cleanses color treated hair to enhance shine & hair color vibrancy. Color Extend Magnetic's formula features a multi-targeted delivery system with key ingredients to prevent hair color fade & promote the health of the hair. The Color Extend Magnetics System is acidic, which helps to balance the p H levels of the hair & care for the tone & vibrancy of professional color in between salon services.