cupel


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Synonyms for cupel

a small porous bowl made of bone ash used in assaying to separate precious metals from e

References in periodicals archive ?
Firstly a cupel (1.7 cm diameter) of sifted bone ash is struck with a hammer in an iron cupel mold with its corresponding stamp.
The slag is discarded while the button is subjected to cupellation, during which the precious metals are separated from the lead and other metallic impurities during a melting process which takes place in a flat porous dish made of a refractory material called cupel, onto which a blast of hot air is directed in a special furnace.
Wrapped samples are placed on porous blocks, known as cupels, and when in the furnace the cupels absorb the lead and any base metals as oxides.
Costs, including those associated with cupels, furnaces, chemicals, power consumption, and the environment, are considerably reduced.