Alpecin Grey Attack Caffeine & Colour Shampoo - 5 x 75 ml - Gradual Hair Darkening | Natural Colour Result from 3-4 Weeks | Hereditary Hair Loss is PreventedEasy to use: First results are usually shown after 3 4 weeks. Continuous application enhances the colour effect, ideal for reducing grey hair Perfect colour Alpecin Grey Attack allows gradual hair darkening. Reduction of grey hair occurs gradually, with visible changes typically after 10 15 applications over 3 4 weeks Perfect for use with natural effect: the innovative 5. 6 DHI colour particles react with atmospheric oxygen. So the hair colour darkens