United States 1993 - 20 Dollars Federal Reserve Note New York District Insufficient Inking Error (Friedberg 2079-B)
This kind of production fault is caused when the intaglio plate receives too little ink or when the wiping cloth removes excess pigment unevenly across the surface. Because each sheet is printed under heavy pressure, insufficient ink application yields these pale, ghost-like impressions. Severe cases like this one are very seldom seen in high-denomination modern notes, as they typically fail Bureau of Engraving and Printing quality-control inspection. Read more →