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A comment on A looming copper crunch and why recycling can’t fix it. Parent comment

Re:A looming copper crunch and why recycling can’t fix it by gerdesj on Sunday July 31, 2022 @04:33PM (#32298567)
Back in the late '70/early '80s the UK 10p coin was similar enough in size and weight to fool some German vending machines as a "1 DM" coin (Deutchmark). The rough rule of thumb rate of exchange was 1 GBP to 4 DM back then.
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Re:A looming copper crunch and why recycling can’t fix it by sva_ on Sunday July 31, 2022 @05:02PM (#32298810)
A large number of European vending machines still accept the 10 thai baht coin as a 2 Euro coin (10 baht are approx. 30 cents).

I heard the newer machines use a combination of methods, including weight and electrical resistance to test if a coin is actually the right one.

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