Any ideas how to determine whether a coin is copper or brass?...

Iron Patch

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I have a token that is only known to exist in copper, but I have one that sounds and registers well below what it should and I'm thinking it could be brass.

For any Explorer users the copper version hits on digital at 28, this one comes in at 6! I played around comparing targets and the perfect match for screen reading and sound turned out to be a cast brass button. I am fairly confident it has to be a metal other than copper but I have to find out for sure.

A quick follow up question...

Do you think a coin could be chemically altered to have a drastically different sound? ... and that's keeping the condition of being very readable on both sides and not really corroded. That's the only other explanation possible for this to be copper.
 

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