For those who’re inside the U.S., all real bills should have a watermark of the person whose portrait is about the bill. They’ll even have a security thread embedded while in the paper that glows below ultraviolet light-weight. All dollar notes have little purple and blue fibers embed

The pen has an iodine Answer that reacts with the starch located to the Wooden-based paper used to make fake bills. When applied on the fake bill, the solution discolors it. The iodine Resolution doesn’t respond with authentic bills as these are produced with fiber-dependent paper. Some tra