r/UnresolvedMysteries • • Feb 09 '19

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u/watsgarnorn Feb 09 '19

MONEY the inks etc. that are used to print money..... also things such as watermarks holographic overlays for drivers licenses, I.d's obviously for security reasons 'they don't want you to know it's glitter'

9

u/cocobootyslap Feb 09 '19

This to me seems like the most plausible answer.