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Ancient Roman artisans crafted a glass chalice, known as the Lycurgus Cup, using nanoparticles of gold and silver so that it would appear different based on the type of liquid in the cup. On display, it appears jade green when lit from the front but blood-red when lit from behind. – WTF Fun Facts
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source https://earn8online.com/index.php/146086/wtf-fun-fact-ancient-romans-use-of-nanoparticles/
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