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Combating Counterfeiters: Defense is in the Details

Photo: Fred LaSenna for CNBC.com

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Microprinting

Microprinting also can be found around the portrait. The words "The United States of America" are printed on Grant's collar on the $50 bill. (Note the words are only somewhat legible in slide 1 and look almost like a single line to the naked eye on a non-magnified bill.)

Photo: Fred LaSenna for CNBC.com