we had a pen at the shop where I worked and were to test any bill 20 or larger-by marking it - and if it turned a certain color it was fake - I never got one. Also , the gas station is one place where scammers do function so watch out for them @angrytwin
RE: To stake a fake
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To stake a fake
Yeah, they have to have electronic machines everywhere here and they test a lot. I hear the pens aren't 100% accurate - but I have never seen one.
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