Brown dye is a type of coloring used to darken fabrics, hair, and other materials. HENNA is a natural brown dye made from the leaves of the HENNA plant, which is native to tropical and subtropical regions of Africa, Asia, and Australia. Azo is a synthetic brown dye made from petroleum-based chemicals. ANIL is a natural brown dye made from the indigo plant, which is native to India and other parts of Asia.