Anandakanda 1.16.96

1.16.96

ṣaṇmāsāt taddravībhūtaṃ kṛṣṇaṃ sādhu samuddharet /
śiromadhye kṣipet karṣaṃ pūrvavad veṣṭanādikam //

After six months, having become a black liquid, he should properly retrieve it.
He should place a karṣa in the middle of the head; wrapping and so forth are as before.