Organic hair colour is made from natural, safe ingredients. It doesn't contain chemicals found in typical hair colour, such as ammonia, sulphates, parabens and resorcinol, which are thought to be harmful to your health. Organic colours use dyes derived from plants.
Henna is a common type of organic dye that was used by the ancient Egyptians. It’s made from the ground leaves of a shrub that grows in northern Africa. Henna produces red, auburn or brown shades. It can be used to darken or add reddish highlights to your hair, but not to lighten your hair all over.
Some people are allergic to henna, so always do a patch test about two days before you use it.
Other sources of organic dyes are rosemary and black walnuts, which will darken your hair, and chamomile, which will bring out blonde highlights.