जातिहिङ्गुलुकेन पुष्पकासीसेन वा गोमूत्रभावितेन दिग्धेनाग्रहस्तेन संस्पृष्टं सुवर्णं श्वेतीभवति ॥ कZ_०२.१३.१९ ॥
jātihiṅgulukena puṣpakāsīsena vā gomūtrabhāvitena digdhena agrahastena saṃspṛṣṭaṃ suvarṇaṃ śvetībhavati
Gold, when touched with the forehand/fingertips smeared with purified cinnabar (hiṅguluka) or with ‘flower’ vitriol (puṣpa-kāsīsa), prepared/activated with cow’s urine, turns whitish (indicating improper composition/treatment).
They give the state a repeatable method to detect alloying/surface plating, supporting consistent valuation and prosecution.