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speculum metal
spec·u·lum met·al


noun 
Definition:
 
copper-tin alloy used for mirrors: an alloy of copper and tin, sometimes with other metals. It is hard, brittle, white, resistant to corrosion and, because it can be highly polished, is used for metal mirrors.
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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