Kautilya's Arthashastra 2.14.25

2.14.25

paścād bandhane ācitakapattraparīkṣāyāṃ vā rūpyarūpeṇa parivartanaṃ visrāvaṇam, piṇḍavālukānāṃ lohapiṇḍavālukābhir vā //

When, intentionally causing the crucible (containing the bullion) to burst, a few sandlike particles of the metal are picked up along with other particles of a base metal previously put therein, and the whole is wrought into a mass for the intended coin or ornament), this act is termed dropping (visravana); or when examining the folded or inlaid leaves of an ornament (áchitakapatrapariksháyám) deception is perpetrated by substituting silver for gold, or when particles of a base metal are substituted for those of gold, it is termed dropping (visrávana) likewise.