Yes, they do.
When you mark a $100 bill with a special counterfeit detection pen, it should ideally leave a mark that turns yellow. If the pen marks a dark color, such as brown or black, it may indicate that the bill is counterfeit. The pen works by reacting with the starch in paper, which is absent in genuine currency.
An ink pen, even the permanent type, can't leave permanent marks on the skin with normal use; no matter how dark you make the mark it'll wash off eventually.
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tattoos or pen marks
No, a counterfeit pen may not be effective for detecting counterfeit 1969 100 dollar bills because they were printed with the same type of paper used for genuine bills at the time. It is recommended to use other methods such as ultraviolet light or consulting with an expert for verification.
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Stain stick
Jel pen ink may be too thick or appear as a smudge on OMR sheets, making it difficult for the scanner to read the marks accurately. OMR scanners are designed to read pencil marks or thin pen marks more effectively because they create clearer and more consistent marks on the paper.
No, a real 1950 twenty dollar bill should not be marked as fake by a counterfeit pen since the technology used in the pen is designed to detect specific features found in modern counterfeit bills. The ink on a legitimate 1950 bill may react differently with the pen due to its age, but it should not be mistaken as fake solely based on the pen test.
it makes marks
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