Do You Know Your Money
Use an ultraviolet (black) light to look at security threads.
Learn to Know Your Money - USD
Ways to Detect Counterfeit US Money
The $5 dollar bill should glow blue; the $10 bill should glow orange; the $20 bill should glow green;
the $50 bill should glow yellow; the $100 bill should glow pink.
If your bill remains white under a black light, it is likely a counterfeit.
How well do you know your money?
But be careful: paper money is only paper