Rasarnava 7.129

7.129

dhamed drutaṃ bhavelloham etaireva niṣecayet
aṅkolasya tu mūlāni kāñjikena prapeṣayet
lohalepaṃ tato dadyāt agnisthaṃ dhārayet priye //

One should blow: the metal becomes melted; with these very [juices] one should quench it.
One should grind the roots of *aṅkola* with sour gruel,
then apply a paste on the metal and keep it on the fire, O beloved.