black copper

The Black Palmer—dubbed with black copper coloured peacock's harl, and a black cock's hackle over that, wings, blackbird.

The same method is adopted for taking out the black copper in successive layers.

The refining of this black copper is performed in a kind of reverberatory furnace.

The black copper oxide is reduced to reddish metallic copper by the carbon monoxide, which is thereby changed to carbon dioxide.

I lifted up the head which covered his treasure, when to his surprise a few black copper cents made their appearance.