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An almost pure copper produced in an intermediate stage of copper refining.
[From its blistered appearance.]
(Metallurgy) an impure form of copper having a blister-like surface due to the release of gas during cooling
a matte of impure copper with a blistered surface caused by the escape of gas during solidification.
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|Noun||1.||blister copper - an impure form of copper having a black blistered surface|