Is this wire all copper ? Or is it like a brass copper wire mix? I

What is the Difference Between Copper Cable and Copper Wire?

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Is the copper attached to aluminum or some kind of alloy? Giant circuit breaker. : r/ScrapMetal

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Is the copper attached to aluminum or some kind of alloy? Giant circuit breaker. : r/ScrapMetal

Wire Type: Bare Solid Copper Wire. Lead & Nickel Free. Tamper: Dead Soft. This Wire is Solid : for wire Wrapping, Making Jump Ring, Findings. Wire

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Red Metals 101: A Quick, But Complete Breakdown

What are the risks of connecting copper wire to aluminum wire? - Quora