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When cashiers are handed a twenty dollar bill, they must mark it with red or black ink to check the authenticity.

Shops use different methods to detect counterfeit paper money. One method is to mark it with a special pen, the ink from which will change colour if used on a counterfeit note. However it means a lot of marked notes are in circulation.

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βˆ™ 12y ago
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βˆ™ 14y ago

Most of the marks come from chemical pens designed to detect counterfeit bills.

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Q: Why are so many twenty-dollar bills marked with red or black ink on the edge of the bill?
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