Herbatint Hair Dye - Light Copper Chestnut 5R is a herbal based permanent hair colour with aloe vera, no paraben, no ammonia and only 3% peroxide. Herbatint grows out and hair re-growth will need re-colouring in approximately four weeks. Herbatint has fewer chemicals than are in other permanent hair colours on the market and unlike products which contain ammonia it has no smell once mixed. The absence of ammonia results in little or no penetration of the epidermis and is less likely for people to have allergic reactions.