The item is tarnished so the color test does not help. Any other pointers?
Md Ariful Islam
বিএসসি(সিএসই)
,
এমবিএ(মার্কেটিং)
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Dr. Md Rushad Rahman
এমবিবিএস(আরপিএমসি)
,
পিজিটি(মেডিসিন)
Try the sound test against two different materials. Copper will not make much of a sound, but brass will ring loud and clear. Sound is probably the most foolproof way to test the difference between copper and other metals.
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