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"From water marks to colored threads, governments are constantly adding new features to paper money to stay one step ahead of counterfeiters. Now a longhorn beetle has inspired yet another way to foil cash fraud, as well as to produce colorful, changing billboards and art displays. In the journal ACS Nano, researchers report a new kind of ink that mimics the beetle’s color-shifting ability in a way that would be long-lasting and difficult to copy."
