Originally published at: https://boingboing.net/2019/01/08/invisible-ink-features-fou.html
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Bodily fluids fluoresce under UV light. Just sayin’.
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The arrows are pretty obvious in both images, and they point to nothing. Am I missing the point?
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“Kilroy was here”, I saw it first.
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Look between the letters E and P.
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O hey lookit that - I totally didn’t notice!
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That’s semen
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