Can Plantur 39 Anti-Grey Effect Shampoo bring back the natural tone?

Plantur 39 Anti-Grey Effect Shampoo ensures gradually darker hair. The ingredient 5,6-DHI is responsible for this. Its mode of action is modelled on the natural formation of the dark colour pigment eumelanin in the hair. The hair can therefore become darker, but it is not possible to restore the natural colour of the hair, as this is very individual and depends on the ratio of dark eumelanin to light pheomelanin.