Henna is a traditional, much-loved, temporary tattooing method that's been used for centuries in many different countries around the world. Henna itself comes from the leaves of a special flowering plant – if you want to get technical it's called Lawsonia inermis – and once that's been dried and ground into a paste, it's applied to the skin in elaborate patterns and designs. After that, it's left to dry for a while – it takes around 30 minutes to dry but you need to leave the paste on for at least two hours preferably more for a darker stain – and once it flakes off, the hardened paste reveals the design underneath. This design is a lighter brown colour than the paste before it, and should last for 7 to 16 days. I use Brown Henna which I mix myself from 100% natural ingredients and safe to use. I never use Black Henna as it is not made from natural ingredients and it has been known to sometimes cause allergic reactions.