Anandakanda 2.7.72

2.7.72

mardayellohadaṇḍena varākvāthasamanvitam /
yāmamātraṃ khare gharme sthāpayellohapātragam //

should grind it with an iron pestle along with a decoction of the three myrobalans. / Placed in an iron vessel, one should keep it in the fierce sun for just a three-hour watch.