Indigo powder to naturally deepen the intensity of our herbal hair colours. Indigo oxidizes when exposed to air and water so when the hair colour is mixed with hot water ready for use the indigo is activated. If you are looking for a natural alternative for chemical hair dyes then the indigo powder is a great choice. Indigo powder has amazing hair benefits and is got by powdering the leaves of the indigo plant whose botanical name is indigofera tinctoria. The leaves produce dark blue dye and when applied as a hair dye after using henna gives a dark black colour. Hindi name- neela english name-indigo indian indigo telugu name- nilimandu chettu aviri neela chettu tamil name- neelam avuri amari malayalam name- lita leela botanica name- indigofera tinctoria linn.