Quote: Yes it's more costly in the short term, but how many ruined coins does it take to pay for the practice?
Good advice.
As I said above, I use cardboard 2x2s, even if just for temporary use. If I get a coin from a coin show in a flip, I usually move it to a 2x2 before I leave.
Is that what happened to this 100 yen? IIRC, I bought it in a junk box -- probably no one thought that silver could look like this. I keep it in a 2x2 so it doesn't contaminate nearby coins.
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