Indigo Powder Contains Many Health Benefits to Hair. No ammonia is available in our Indigo Powder. Indigo Powder is a natural dye that is very famous nowadays for coloring hair black. Many people know it as black henna, but it gives a blue dye. When used with natural hennapowder it gives a dark brown to shiny black color. The Indigo powder is made using the leaves of the indigo plant. Indigo powder is a natural hair dye. A natural hair dye, the indigo powder can be used to replace artificial hair dyes.