I've looked with black light and held it up to normal light and don't see any smudge or any out of the ordinary. How do I test this for fake? Is it worth the time?
I can think of two reasons: 1. I believe the pens leave a permanent mark on the bill, which would affect value. 2. All the pens tell you is whether the paper is high grade or not. If a counterfeit is printed on cotton-fiber, starch-free paper instead of standard printer or photocopier paper, the pen will indicate that it is "real".
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