Anandakanda 1.26.185

1.26.185

bhasmamūṣeti vijñeyā tārasaṃśodhane hitā /
<anyā vajramūṣā>
tuṣaṃ vastraṃ samaṃ dagdhaṃ mṛttikā caturaṃśikā //

this should be known as the ash crucible, beneficial for purifying silver.
<Another vajra crucible>
Husk and cloth burnt in equal parts, four parts of clay,