On counterfeit bills the letters rarely match properly. The front side is imprinted with a pearly ink that gives an iridescent effect. Under angled light a shiny gold-colored pattern becomes visible. The gold-colored foil is printed over with black and colored patterns. The foil turns out black on color copies.
Most people can read the small print with the naked eye.
Others may need a magnifying glass. In counterfeit bills the smallest print is usually illegible. Notify the police as soon as possible if you think that a bank-note has been counterfeited. Do not compare with the reproductions in this brochure, which always differ from the original. Unfold a received bank-note and look at the front and the back.