Henna powder is a natural dye derived from the leaves of the Lawsonia inermis plant, also known as the henna plant or mignonette tree. Here’s an in-depth description of henna powder Henna has been used for centuries as a natural dye for hair, skin, and textiles. It imparts a reddish-brown color when applied, due to its natural pigment lawsone. Some people enhance their henna paste with additional natural ingredients like indigo powder.