Security ink, also known as invisible ink, is clear and cannot be seen in normal Light. This special purpose ink is revealed when exposed to a UV Black Light wavelength of 365nm to 405nm. So, in other words it is invisible until a UV Black light is switched on.
New York printer DataGraphic used this to great marketing effect at the 2023 PaperSpecs Live NY event, revealing the winners of special prizes depending on the message that was revealed under the black light.
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