Anandakanda 2.1.251

2.1.251

<mayūratutthasattvapātanam>
tutthaṃ ca ṭaṅkaṇaṃ caiva tulyaṃ ślakṣṇaṃ vimardayet /
mūṣāyāṃ taṃ vinikṣipya ruddhvā tīvrāgninā dhamet //

<Extraction of peacock blue vitriol essence>
One should finely grind vitriol and borax in equal parts;
placing it in a crucible and sealing it, one should blast it with an intense fire.