What are 'bronze' coins made from? Why are some magnetic and some not?

UK 1p and 2p coins were originally made from bronze, consisting of 97% copper, 2.5% zinc and 0.5% tin. Since September 1992, they have been made from copper-plated steel.

Because steel is magnetic, newer 1p and 2p coins are attracted to magnets, while the older bronze coins are not.

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