Why do cashiers mark with a marker on money
It is a special marker that shows if the bill is counterfeit or not. If the ink stays yellowish it is good, if it turns dark it is fake.
That's a marker that's invisible on a real dollar bill, but shows up on a fake bill. It's just for detecting counterfeit money.
to make sure its not fake
to tell if it is counterfit or not
to see if its real
its a counterfeit currency marker. It comes up yellow if the paper is correct, black on incorrect paper. Its not perfect, but the paper is one of the best counterfeiting defenses. You can buy them from any office supply store for a couple dollars.
To see if its fake
just to say its real