Security threads on bills glow in different colors
Want to learn how to spot counterfeit money? Embedded security threads are also used to protect against counterfeiting. If you have a UV light, hold it up to your bill to see the thread glow:
On the $5 bill, the thread glows blue.On the $10 bill, it glows orange.On the $20 bill, it glows green.On the $50 bill, it glows yellow.On the $100 bill, it glows pink.