Anandakanda 1.23.139

1.23.139

yāvatpādāṃśakaṃ jīrṇaṃ gandhaṃ ca piṣṭikā bhavet /
divyā sā sarvakarmārhā devānāmapi durlabhā //

until a fourth part of the sulphur is digested, and it becomes a paste.
It is divine, suitable for all operations, and rare even to the gods.