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black copper
noun
, Metallurgy.
- a regulus of 95-percent-pure copper, produced in a blast furnace by smelting oxidized copper ores.
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Example Sentences
The Black Palmer—dubbed with black copper coloured peacock's harl, and a black cock's hackle over that, wings, blackbird.
From Project Gutenberg
The same method is adopted for taking out the black copper in successive layers.
From Project Gutenberg
The refining of this black copper is performed in a kind of reverberatory furnace.
From Project Gutenberg
The black copper oxide is reduced to reddish metallic copper by the carbon monoxide, which is thereby changed to carbon dioxide.
From Project Gutenberg
I lifted up the head which covered his treasure, when to his surprise a few black copper cents made their appearance.
From Project Gutenberg
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