Fortunately, it's easy to tell if a 100 dollar bill is real if you know what to look for. As of June 30, 2012, the $100 bill comprised 77% of all US currency in circulation. Remember not to put it in with the other bills. You can also call the Secret Service directly, if you want. $100 Series 1985 And 1988 - Unused -How To Identify If Real? - Coin A Facebook user shared a post on Sept. 9that has an image of a $100 bill with the caption "psa to all the scammers stop getting $100 bills out of the bank. 5. The color and shade of these numbers should match that of the bill's Treasury Seal. 10. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. Shutterstock. Is the $100 dollar bill blue or green? The consequences of depositing a fake check even unknowingly can be costly. The Security Strip is a thin, faint embedded strip that runs vertically across the note from top to bottom, just to the left of Ben Franklin in the $100 bill. 375 nanometer) UV light, will fluoresce, or glow a unique color. Nevertheless, counterfeiters struggle to reproduce the raised printing, so feeling the bill is a good first step. A counterfeit detector pen contains an iodine solution that reacts with the starch in wood-based paper to create a black, blue or brown mark. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. The United States one-hundred-dollar bill ($100) is a denomination of United States currency. The average $100 bill stay in circulation for seven years. Without advertising income, we can't keep making this site awesome for you. You can also hold the bill up to a light to see if it's real. Tilt the bill, and designs along the strip change from bells as in, Liberty Bells to the number "100," in moving patterns. How do you test a 100 dollar bill with UV light? You can see the security strip, with repeating micro-printed text USA $100 on the $100 bill, USA $20 on the twenty dollar bill, and so on. How many types of 100 dollar bills are there? The Kiwi dollar (US$0.72/0.50) is one of the world's least counterfeited currencies. Its actually part of a security feature designed to help tell real $100s from fake ones. 1. 2. Don't deal with the counterfeit note.