पीतकास्ताम्रकास्ताम्रपीतका वा भूमिप्रस्तरधातवो भिन्ना नीलराजीवन्तो मुद्गमाषकृसरवर्णा वा दधिबिन्दुपिण्डचित्रा हरिद्राहरीतकीपद्मपत्त्रशैवलयकृत्प्लीहानवद्यवर्णा भिन्नाश्चुञ्चुवालुकालेखाबिन्दुस्वस्तिकवन्तः सुगुलिका अर्चिष्मन्तस्ताप्यमाना न भिद्यन्ते बहुफेनधूमाश्च सुवर्णधातवः प्रतीवापार्थास्ताम्ररूप्यवेधनाः ॥ कZ_०२.१२.०५ ॥
pītakās tāmrakās tāmrapītakā vā bhūmiprastaradhātavo bhinnā nīlarājīvanto mudgamāṣakṛsaravarṇā vā dadhibindupiṇḍacitrā haridrāharītakīpadmapattraśaivalayakṛtplīhānavadyavarṇā bhinnāś cuñcuvālukālekhābindusvastikavantaḥ sugulikā arciṣmantaḥ tāpyamānā na bhidyante bahuphenadhūmāś ca suvarṇadhātavaḥ pratīvāpārthās tāmrarūpyavedhanāḥ
Gold ores from earth/rock may be yellowish, coppery, or copper-yellow; when broken they may show blue streaks like a blue lotus, or colours like green gram, black gram, or rice-gruel; or be mottled like curd-drops and lumps; or like turmeric, harītakī, lotus-leaf, algae, artificial verdigris, spleen-colour, or flawless hues. When broken they may bear lines, dots, sand-like grains, and even swastika-like marks; they appear as small rounded pellets, are lustrous, and when heated do not split; they emit abundant froth and smoke. These are gold ores, suitable for alloying, and capable of ‘piercing’ (assaying/indicating) copper and silver.
Because heat response is a practical authenticity/quality signal relevant to smelting outcomes; it reduces processing losses and guides state acceptance/rejection.