Common Name : Indigo Other Name : Nili, Indian Indigo. Botanical Name : Indigofera Tinctoria Linn. Plant Family : Fabaceae Part Used : Dried Leaf Overview : People Have Used Indigo Alone Or In Combination With Henna To Dye Their Hair Black Since Thousands Of Years Indigotin. Indigofera tinctoria plants contain the glucosides indicant. After soaking the plants in water, enzymic hydrolysis transforms indicant into indoxyl and glucose. Indigotin (often also called indigo or indigo-blue) formation results from the grouping of two molecules of indoxyl in the presence of oxygen.