Alpecin Shampooing Grey Attack XStrong cheveux gris (200 ml)

A shampoo that darkens grey hair gradually, wash after wash, instead of colouring it in one go. Pigment builds up slowly: after five to seven washes the difference shows, and it is maintained simply by carrying on. XStrong is the most concentrated version in the range, meant for clearly grey hair. It also contains caffeine, like the rest of the brand. Wear gloves if you would rather keep pigment off your hands, and leave it on for five minutes.