Well I bought this item...?
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answers
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Answer it!
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IF this is what you bought, it has been exposed already and has gone BAD. Return it ASAP so no one thinks you did it on purpose.
I don't know, just thinking aloud.
Eh it may be UV ink, a blacklight would make it appear...
Could be activated by another agent that they've not included...
Sometimes it's heat, you can make your own with lemon juice or some such, I'll look in to that but it's heat that shows it...
Other than that, look at similar products for ideas, try what they use, eventually you'll find something...
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