Answer: cupels

AnswerCrossword Clue
CUPELSSmall cups used in assaying.
CUPELSAssaying receptacles.
cupelsreceptacle or furnace bottom in which silver is refined
cupelsCUPEL, to refine gold or silver in a small vessel
cupelsto heat or refine in a cupel
cupelssmall, cuplike, porous container, usually made of bone ash, used in assaying, as for separating gold and silver from lead