"Copper" 1p and 2p coins do contain copper, but the bulk of the material is Nickel, which is harder and (AFAIK) cheaper.
I think many are now copper plated steel? Probably makes little difference to ants!
Nickel responds to magnets too.
@MrE started
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"Copper" 1p and 2p coins do contain copper, but the bulk of the material is Nickel, which is harder and (AFAIK) cheaper.