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RE: TIL that Urine was used as Invisible Ink.
Can only be read , if UV lamp is lit.
But Ancient Rome doesn't even have uv lamp yet.
Fictions??? Not Facts
Can only be read , if UV lamp is lit.
But Ancient Rome doesn't even have uv lamp yet.
Fictions??? Not Facts
Can only be read , if UV lamp is lit??? Not, you need just warm the paper up ;)