quinton Posted January 22, 2009 Share Posted January 22, 2009 This guy was tracing patterns on his t-shirt with ultraviolet LEDs. The shirt was absorbing the light and wherever he traced, it would leave a glowing pattern that would eventually disappear. I asked him what he used and he said he used invisible ink. I ordered some invisible ink of my own and tried it on a shirt but the ink wasn't absorbing the light and leaving glowing trails. The only thing it did was glow if I shined the ultraviolet light over it but it would disappear as soon as I moved the light away or turned it off. Does anyone know what the guy used? Link to comment Share on other sites More sharing options...
UC Posted January 22, 2009 Share Posted January 22, 2009 Most invisible inks are not Phosphorescent, but a few may be. The ink you used seems to be fluorescent, which is similar, but without the slow release of photons. Generally, glow in the dark items make use of a powdered phosphor either trapped in plastic or in paint applied to the item. Were there patterns on his shirt that could have been glow in the dark paint? Link to comment Share on other sites More sharing options...
quinton Posted January 22, 2009 Author Share Posted January 22, 2009 His t-shirt was white and it looked like there was a big yellow stain on the front of it but it didn't look like paint it was a faint yellow. Link to comment Share on other sites More sharing options...
YT2095 Posted January 22, 2009 Share Posted January 22, 2009 probably Zinc Sulphide based then. Link to comment Share on other sites More sharing options...
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