[Bibi]

Henna is a natural pigment they use a lot in Morocco to make drawings on hands for certain festivities (or anytime if you´re a tourist), it will fade in about a week (if you don´t wash your hands, that is). You can also use it to die your hair, certainly you´ve seen the deep red that was so fashionable in the 80s? You had to mix this green powder with boiling water, make a very smelly mud and leave it in your hair for 10 hours orso.
I think nowadays you can get henna in a practical tube with some other colorings, not just red, to make temporary tattoos.