Indigo herb for dyeing gray hair

Indigo herb, also called Nila, a natural Indian herb originally from India, for dyeing white hair to black or brown when used with henna. A spoonful of the herb is placed, then only lukewarm water is added, and applied to the hair. For only two hours, it gives a black color, and with henna, it gives a brown color. Its features include not drying the hair like Wusmah and Katm. The weight of the package is 50 grams, enough for 5 times.