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Colorful, Magnetic Janus Balls Could Help Foil Counterfeiters

Anti-counterfeiting tags to help identify knockoffs of popular handbags, shoes and other items are in high demand. Now, researchers reporting in ACS Nano have developed tiny, two-sided “Janus balls” that show their colored side under a magnetic field. ACS’ Headline Science shows how these microparticles could help foil counterfeiters.