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Henna, Lawsonia inermis, is a plant. It is a large bush, or a small tree, that grows in warm and dry climates. Since ancient Egypt, five thousand years ago, henna was regularly used to dye hair and may have been used in Jericho already eight thousand years ago. Henna was used to keep hair healthy and to color white hair. Henna leaves are harvested, dried, and powdered. When mixed with a slightly acidic liquid, henna will dye the skin, hair, and nails red-orange. Henna leaves contain a red-orange coloring molecule, lawsone, visible in the central vein of young leaves. Henna leaves contain one t..