Hair-blackening preparation of nili, bhringaraja and triphala juices with metal powders

Nili juice, bhringaraja juice and triphala decoction, one prastha (64 tola) each, and one prastha of sesame oil are mixed and kept. Pieces of the heartwood of vijayasara (asana, the hard inner wood left when the outer bark is removed), two drona in measure, are filled into a pot and, by the method used for extracting bhallataka oil, burned so that the liquid runs downward (adhahpatana), and this asava is collected. Then one prastha of powdered copper, iron, nilanjana (surma) and bronze, in equal parts, is rubbed well in an iron vessel without any liquid, cooked on a mild fire with an equal amount of the juices above, kept in a heap of grain for four months, taken out and worshipped. White hair, like kasha grass, is first smeared with triphala paste and washed with triphala decoction, and the medicine is then applied quickly; the hair is said to become black and glossy like a heap of collyrium.