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blister copper

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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:
1860–65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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blister copper  
n.  An almost pure copper produced in an intermediate stage of copper refining.

[From its blistered appearance.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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