Counterfeiting is an arm's race to nowhere. An endless struggle, with both sides trying to out-wit the other. While treasuries all around the world try to find new ways to make counterfeiters sweat, and ultimately unable to make fake money, the counterfeiters in the world just need to figure out how those individuals are making new money, and copy it. There have been plenty of options in the past, like watermarks, ink that never dries, holograms, and colors that can't be copied. But, they've all been figured out in one way or another. But now, thanks to thin-film transistors, it may be almost impossible for counterfeiters to get the job done.