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When you make a mark on genuine money with the pen, the mark will remain pale yellow. Simply put, when you mark on real money, there is no chemical reaction, and the mark stays yellow. When you mark on a counterfeit bill, a chemical reaction occurs, and the mark turns dark.

All United States bills have a combination of 11 numbers and letters. The serial numbers appear twice on the bill's front?one set of serial numbers is on the left of the portrait, and the other is on the right. Make sure both sets of serial numbers match.

Look at the serial number on the bill. The color and shade of these numbers should match that of the bill's Treasury Seal. Counterfeits also tend to have numbers that are unevenly spaced or lined up crooked. Look for the distinctive red and blue fibers woven into the bill's paper.

If you're looking for an app to help identify bills, check out Cash Reader. Cash Reader is a money-reading mobile app designed specifically for individuals who are blind or visually impaired. To use the app, simply point your phone's camera at almost any banknote and instantly hear the value.

Security Thread All genuine FRNs, except the $1 and $2, have a clear thread embedded vertically in the paper. The thread is inscribed with the denomination of the note and is visible only when held to light. Each denomination has a unique thread position and glows a different color when held to ultraviolet (UV) light.

Security Thread All genuine FRNs, except the $1 and $2, have a clear thread embedded vertically in the paper. The thread is inscribed with the denomination of the note and is visible only when held to light. Each denomination has a unique thread position and glows a different color when held to ultraviolet (UV) light.

Here is a list of eight ways to tell if a bill is real or counterfeit: Color-shifting Ink. ... Watermark. ... Blurry Borders, Printing, or Text. ... Raised Printing. ... Security Thread with Microprinting. ... Ultraviolet Glow. ... Red and Blue Threads. ... Serial Numbers.