Anandakanda 1.4.51

1.4.51

pratyekaṃ śodhitaṃ deyaṃ tāmravatpādamātrakam /
pāṭhādikarasaiḥ kuryānmardanaṃ pātanaṃ kramāt //

each, purified, should be added to the measure of one-fourth part, like copper. / One should perform grinding with the juices of pāṭhā and other herbs, and distillation in succession.