Look above the bill to determine if you could find some obvious microprinting. Some counterfeiters also have microprinting, however it is blurry and may very well be in various places. Sense the floor of the bill to be sure the paper is a little bit rough as well as ink https://express-page.com/story2245669/the-definitive-guide-to-how-to-identify-a-counterfeit-100-bill