Anandakanda 1.23.199

1.23.199

ruddhvā tāṃ vajramūṣāyāṃ chāyāśuṣkaṃ puṭellaghu /
chagaṇairekavṛddhyā tu triṃśadvāraṃ puṭaiḥ pacet //

Sealing it within an adamantine crucible and shade-drying it, one should heat it gently in a pit fire. / Increasing by one cow dung cake [each time], one should cook it through thirty incinerations.