We select only the best Ayurvedic herbs to produce our BIO HENNA for hair . ORIENTANA BIO HENNA does not contain: – chemical colour enhancers, dyes and pigments – preservatives, aromas and fragrance additives – 3-nitro-p-Hydroxyethylaminophenol During each subsequent dyeing, BIO HENNA penetrates the hair and simultaneously creates a layer of color on its surface, which thickens and protects the hair. With subsequent applications, another layer of BIO HENNA is applied to the end parts of the hair, while the regrowth in the natural hair color is covered with BIO HENNA for the first time. If the hair color on the regrowth is significantly different from the applied BIO HENNA color, the effect achieved on the regrowth will naturally be slightly less intense than on the ends of the hair dyed for the second time. This is a completely normal phenomenon when using henna, and the specific unevenness of the color makes the hair gain a light color and a natural visual effect!