Anandakanda 2.5.50

2.5.50

<lohabhasmavidhiḥ (6)>
arjunasya tvacaḥ peṣyāḥ kāñjikenātilolitāḥ /
tanmadhye kāntacūrṇaṃ ca kāṃsyapātre vinikṣipet //

<Method 6 for iron calx> / The bark of arjuna should be ground and well stirred with sour gruel; / into that, one should throw the loadstone powder in a bell-metal vessel.