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forsale [732]
3 years ago
11

When a counterfeit detection pen is used on an authentic bill, what color does it turn?

Biology
1 answer:
garik1379 [7]3 years ago
7 0
If the bill is counterfeit and the paper is wood-based, the iodine in the pen solution will react with the starch and leave a dark brown or black mark.
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