3 ms·I'm not sure I'd like a coin that has high chemical reactivity. They got that part right.by meric 11y agoI'm not sure I'd like a coin that has high chemical reactivity. They got that part right.adrianN 11y agoMany countries have Aluminium coins, that's a very reactive metal.carlob 11y agoBut Aluminium is not that reactive once the surface has oxidized.meric 11y agoHow long have they had them for?adrianN 11y agoThe 1 Yen coin exists since the fifties.delibes 11y agoMeh - we get on fine with paper and plastic money in many places. Or digital. I'm glad I don't have to buy dinner with a big bag of platinum, gold, silver, copper coins etc.