Anandakanda 2.1.278

2.1.278

dārvīkvāthabhavaṃ kaṇṭhavikāsi kṣiptam akṣṇi yat /
tad rasāñjanamuddiṣṭaṃ kaṣāyaṃ kaṭu tiktakam //

That which is produced from a decoction of tree-turmeric, clearing the throat when applied to the eye—
that is taught as rasāñjana; it is astringent, pungent, and bitter.