https://www.indus-valley.com/organic-indigo-powder.html

Indus Valley presents 100% Bio-Organic Indigo Leaf Powder to colour hair in different shades varying from brown to black. The triple-sifted micro-fine powder is obtained by dried leaves of Indigofera Tinctoria plant. It is completely natural Indigo powder thus safe to use on skin. It is great when mixed with henna as offers colour with nourishment.