Using magnifying glasses.

PositionNews & TRENDS - Matsumura Technology specializes in counterfeit bill detection - Brief article

Using magnifying glasses, workers at Matsumura Technology in Tokyo compare blown-up sections of counterfeit $100 biLLs against a genuine bill that has been enlarged 400 times. According to the company, which specializes in the production of counterfeit-detection equipment, this method is the...

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