Anandakanda 1.9.131

1.9.131

ruddhvā taṃ saṃpuṭe pacyātkukkuṭākhye puṭe pacet /
punastrisaptadhā bhṛṅgadhātrīnīraiśca bhāvayet //

Sealing it in a container, one should cook it; one should bake it in the puṭa called kukkuṭa. / Then one should levigate it again twenty-one times with the waters of bhṛṅga and dhātrī.