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This heading covers :
(1) Black copper. It consists of an impure form of copper produced by smelting oxidised copper ores or impure copper scrap, usually in a blast furnace. The copper content varies widely, usually in the range of approximately 60 to 85 % by weight. (2) Blister copper. It consists of an impure form of copper produced by blowing air through molten copper matte. During the conversion process, sulphur, iron and other impurities are oxidised. The copper content is normally about 98 % by weight. (3) Copper anodes for electrolytic refining.
Copper partially refined by complete fusion is cast into anodes for further refining by electrolysis. These anodes are usually in the form of slabs cast with two lugs for suspending them in the electrolytic refining tank. They should not be confused with anodes for electro-copper-plating (heading 74.19).
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