Kautilya's Arthashastra 2.12.9

2.12.9

yavamāṣatilapalāśapīlukṣārairgokṣīra.ajakṣīrair vā kadalīvajrakandapratīvapo mārdavakaraḥ //

(Metals) are rendered soft when they are treated with (the powder of) kandali (mushroom), and vajrakanda, (Antiquorum) together with the ashes of barley, black beans, palása (Butea Frondosa), and pelu (Carnea Arborea), or with the milk of both the cow and the sheep. Whatever metal is split into a hundred thousand parts is rendered soft when it is thrice soaked in the mixture made up of honey (madhu), madhuka (Bassia Latifolia), sheep's milk, sesamum oil, clarified butter, jaggery, kinva (ferment) and mushroom.