The innovative repigmentation technology is based on a patent-pending active ingredient: 5,6-DHI. This accumulates in the hair during washing and reacts with oxygen in the air to form the color pigment. As a result, the hair tone gradually darkens. A permanent color develops that grows with the hair. In addition, the well-known caffeine complex protects against premature hair loss by providing growth energy to the hair roots. Leave on the scalp for 2 to 5 minutes, from application until rinsing. It is recommended that a longer application time intensifies the color effect! Use daily for the first few weeks until the desired color is achieved. Then, alternate with a regular shampoo to maintain the color tone. The color intensity can be controlled by the exposure time and frequency of application. Suitable for any hair color, especially light brown and black hair.