Anandakanda 2.5.30

2.5.30

jambīrair āranalairvā viṃśatyaṃśena hiṅgulam /
piṣṭvālipya puṭe ruddhvā tallohe pācayetpunaḥ //

or with limes or fermented gruel, grinding cinnabar in a twentieth part [of the iron], / coating it, sealing it in a roasting crucible, one should cook that iron again.