Rasaprakashasudhakara 4.17

4.17

hemnaḥ sūkṣmadalāni bhūrjasadṛśānyādāya saṃlepya vai vajrīdugdhakahiṅguhiṅgulasamair ekatra piṣṭīkṛtaiḥ
satyaṃ saṃpuṭake nidhāya daśabhiścaivaṃ puṭaiḥ kukkuṭaiḥ pācyaṃ hema ca raktagairikasamaṃ saṃjāyate niścitam //
lohaparpaṭīkābaddhaṃ mṛtaṃ sūtaṃ samāṃśakam
vidrute hemni nikṣiptaṃ svarṇabhūtiprabhaṃ bhavet //

Taking thin sheets of gold resembling birch bark and thoroughly smearing them / with equal parts of euphorbia latex, asafoetida, and cinnabar triturated together into a paste, / placing them truly in a sealed container and thus baking with ten cock-pit incinerations (kukkuṭapuṭa), the gold certainly becomes equal to red ochre. / Calcined mercury bound as an iron flake, in equal part, / thrown into molten gold, will become endowed with the lustre of calx of gold.