The present participle or gerund form of cupel; the process or act of refining metals using cupels.
Present participle of 'cupel' formed by adding '-ing.' Describes the ongoing action of subjecting metal to the cupellation process.
Watching someone describe cupeling—the heating, the oxidation, the separation of precious from base—shows how English adds '-ing' to turn any action into a noun, a linguistic feature that lets us name processes and make abstract things feel concrete.
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