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Question:

Is there a black spot on the copper core of the Far East copper wire?

Is there a black spot on the copper core of the Far East copper wire?

Answer:

That's the copper wire inside the oxidation, and the requirements are not high, you can also use, this is not good quality control
This is not copper oxidation. The color of copper oxide is green, not black.
That is copper, of low purity, mixed with other cheap metals.

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