कालायसस्यार्धभागाभ्यक्तं कृष्णं भवति ॥ कZ_०२.१३.५५ ॥
kālāyasasyārdhabhāgābhyaktaṃ kṛṣṇaṃ bhavati
ពេលលាប/ព្យាបាលដោយដែកខ្មៅ (kālāyasa) កន្លះភាគ វាក្លាយជាពណ៌ខ្មៅ។
Surface treatments can disguise base metals; state knowledge of such methods supports enforcement against fraud in bullion, ornaments, and coin-like pieces.