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Compare the density with coppers known density (8.94g/mL) by weighing the mystery metal's mass and dividing by it's volume, which can be determined by measuring how much water the metal displaces when submerged.

(Additionally, by heating a portion of it briefly in the presence of oxygen a dark blackish-brown color of copper oxide should become visible. Heating it with a direct flame from a small torch should produce a green flame quite easily as well.)

All of these tests will allow one to determine if an item is "REAL" copper. They will not assure one that the copper is "PURE" copper (even the density test can be fooled by a witty seasoned metallurgist)

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Q: How can you tell if an item is real copper?
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