cupel

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cupel

[′kyü·pel]
(metallurgy)
A cup made of bone ash or magnesite, used in assaying precious metals.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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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 houses leaning against each other Crumble among mirrored incisions Of constellations: the Big Bear As in the age of iron, Cupel after cupel of fixed stars.