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Japan’s Currency Technology

Japan’s currency, four banknotes and six coins, features very sophisticated technology. Banknotes have lines inscribed so finely that 10 or more fit in a millimeter, with writing that’s visible only under a magnifying glass. Coins are milled by a unique method to create angled grooves on their edges. All these technologies are very hard to counterfeit. Currency that can be trusted is the basis of a stable society, and the Japan Mint supplies coins to many other countries too. We examine some of the advanced technologies hidden in Japan’s currency.