don't forget the copper coin trick, works a treat.
and boiling water. that too.
You might be surprised at how few copper coins are made from copper - try running a magnet across your loose change... ... not that ants carry magnets?
"Copper" 1p and 2p coins do contain copper, but the bulk of the material is Nickel, which is harder and (AFAIK) cheaper.
@MrE started
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don't forget the copper coin trick, works a treat.
and boiling water. that too.