cupel


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cupel

[′kyü·pel]
(metallurgy)
A cup made of bone ash or magnesite, used in assaying precious metals.
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References in periodicals archive ?
Assaying cupels were recovered from related contexts, as were numerous and variously sized crucible fragments.
A characteristic category of finds is small cupels of bone ash, used in the assaying method known as 'assaying by fire' (as described by Agricola, for example, and Challis 1988: 76).
Of possible significance is the large number of distinctive small bone-ash cupels (cf.