This article is for the many people who have to work around a lot of money that don't want to rely on a pen to spot a counterfeit bill.
One thing that can be searched for when a bill is held up to the light is the watermark. This is the presidential image shown on US bills.
I'm pretty sure I recall hearing that bills can be bleached and written over with larger denominations. This will fool counterfeit pens. Don't put that much faith in them.
When a bill is held up to a light source one can see a string that repeats the denomination amount again and again.
Don't let anyone rush you when your handling money. Many counterfeits are easy to spot when you're calm and not distracted but go unnoticed till it's too late, because the crook made things go in a hurry. This goes along with the whole quick change thing as well.
Real US currency has blue and red fibers placed throughout itself.
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