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Now i'm interested in some invisible ink that you could only see under black light.
The gross but cheap way would be to fill a marker with cat piss- it glows under ultraviolet but your can't see it in normal daylight. Smells like cat piss though. Unless that's what you're going for.
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"Asking a bomb squad if an old bomb is still "real" is not the best thing to do if you want to save it." - denim
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