cupellation


cu·pel·la·tion

noun \ˌkyü-pə-ˈlā-shən, -ˌpe-\

Definition of CUPELLATION

:  refinement (as of gold or silver) in a cupel by exposure to high temperature in a blast of air by which the unwanted metals are oxidized

First Known Use of CUPELLATION

circa 1691

cupellation

noun    (Concise Encyclopedia)

Separation of gold or silver from impurities by melting the impure metal in a cupel (a flat, porous dish made of a refractory material) and directing a blast of hot air on it in a special furnace. The impurities, including lead, copper, tin, and other unwanted metals, are oxidized and partly vaporized and partly absorbed into the pores of the cupel.

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