Glance over the bill to see if you will find some clear microprinting. Some counterfeiters even have microprinting, but it's blurry and could be in numerous spots. Inspect the microprinted terms around the border and the edge with the portrait. Use a magnifying glass to search for the little printed https://thebookmarkid.com/story17106243/the-basic-principles-of-how-to-detect-counterfeit-bills