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blister copper

noun, Metallurgy.
a matte of from 96 to 99 percent copper, having a blistered surface after smelting because of gases generated during solidification.
Origin of blister copper
First recorded in 1860-65 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for blister copper

blister copper

an impure form of copper having a blister-like surface due to the release of gas during cooling
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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