Short answer: Tarnished, oxidised or coated copper is still copper and can be sold, but it is normally graded below bright wire, and tinned or plated wire may be priced differently because the coating has to be dealt with in processing, so keep these grades separate from bright wire and describe them honestly to the buyer.
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List Free →Tarnish and oxidation
Dull or darkened copper is lower grade than bright, though the difference is often modest.
Tinned and plated wire
Some wire has a coating that changes how it is processed and priced.
Be honest
Describing the wire accurately avoids a downgrade at the weighbridge.
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