Fortified hair, healthy-looking and shiny colour, Garnier HerbaShine Hair Colourant works in just 10 minutes and is ammonia-free. It lasts 6-8 weeks and covers hair with up to 70% grey. What is Garnier HerbaShine? HerbaShine, Garnier's first colourant enriched with bamboo extract, leaves the hair feeling fortified with radiant, amazingly shiny colour. Why Bamboo? The bamboo plant is famous for its strength and flexibility. It sways and bends with stong wind but hardly ever breaks. How does it work? The complex enriched with bamboo extract has been added to the ammonia-free colouring cream to help fortify the hair. The result, hair feels fortified and looks incredibly luminous. Will it cover my grey hair? Garnier HerbaShine offers optimal and long-lasting grey coverage.