कालायसस्यार्धभागाभ्यक्तं कृष्णं भवति ॥ कZ_०२.१३.५५ ॥
kālāyasasyārdhabhāgābhyaktaṃ kṛṣṇaṃ bhavati
କଳା ଲୋହା (କାଳାୟସ)ର ଅର୍ଧ ଭାଗ ଲେପ/ଚିକିତ୍ସା କଲେ ତାହା କଳା ହୁଏ।
Surface treatments can disguise base metals; state knowledge of such methods supports enforcement against fraud in bullion, ornaments, and coin-like pieces.