Main product description Anti-grey shampoo with repigmentation technology The revolutionary repigmentation technology is based on a patented active principle: the active ingredient 5,6-DHI accumulates in the hair during shampooing and reacts with atmospheric oxygen, resulting in a gentle color pigment. As a result, the hair tone gradually darkens. Permanent hair color is created that only grows with the hair. In addition, the well-known caffeine complex protects against premature hair loss by providing the hair roots with the necessary energy Use• Leave it on the scalp for 2 to 5 minutes - from application to rinsing. Valid: Longer application time intensifies the coloring effect!• Use daily for the first few weeks until you achieve the desired color result.• Then alternate Gray Attack with your normal shampoo to maintain the hair color as it grows.• Decide for yourself which tone desired color! Color intensity can be controlled by time and frequency of application • Can be used on any hair color - best on light brown to black hair