Anandakanda 2.5.29

2.5.29

tenaiva patraṃ kāntasya limpetpañcapalonmitam /
ruddhvā gajapuṭe pācyaṃ kaṣāyaistraiphalaiḥ punaḥ //

With that, one should coat a sheet of loadstone weighing five palas. / Sealed, it must be incinerated in an elephant pit (gajapuṭa); then again with triphalā decoction,