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A tattoo that disappears on cue
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A tattoo that disappears on cue

So, researchers at the University of Colorado Boulder have developed tattoo ink that changes visibility when exposed to ultraviolet or visible light. Inspired by transition lenses, tiny spheres in the dye become transparent under UV light and return to their original colour when they absorb visible light. Co-creator Carson Bruns has tattooed himself with the ink, which kept working for more than two years. The team hopes it could one day help with temporary medical markings, though more safety testing is needed first.
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