Anandakanda 2.1.174

2.1.174

taddravairmardayedabhraṃ dinaṃ gajapuṭe pacet /
evaṃ saptapuṭaṃ kāryaṃ dadhnā ca puṭasaptakam //

One should grind the mica with that liquid for a day and cook it in an elephant-calcinating pit. / Thus seven calcinations should be done, and seven calcinations with curd;