There are several key rules to ensuring henna comes out dark and lasts for a long time. In our opinion, the most important, is that the artist uses quality ingredients in their mixture. The henna powder needs to be free from impurities and as fresh as possible. We order our organically certified fresh henna, on a regular basis, direct from a supplier in the East. We always ensure that our henna, especially for bridal mehendhi, is no more than 6 months old. When you pick up a tube of henna in store, you have no way of knowing when it was mixed, let alone when the leaves were picked. That henna could be upwards of 2-3 years old when you apply it.