Anandakanda 1.16.62

1.16.62

uddhṛtya lepayecchīrṣaṃ nasyakarmāmunā bhavet /
tryahāt keśāḥ sunīlāḥ syuḥ ṣaṇmāsāt keśarañjanam //

Taking it out, one should smear it on the head; nasal administration may be done with it. / After three days the hair becomes deep black; after six months, hair-coloring occurs.