How to tell if something is made out of copper or brass (or another type of metal) by looking at it without touching it or using any other method to test it

Metal Identification Tests: Methods & Tips On How to Identify Metals

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How to tell if something is made out of brass, bronze or copper? Is there any way to distinguish between them without testing it for purity - Quora

Metal Identification Tests

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How to test a metal to determine if it is copper - Quora