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Combating Counterfeiters: Defense is in the Details

Photo: Fred LaSenna for CNBC.com

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Fine-Line Printing and Microprinting

Very fine lines have been added behind the portrait on the front of new series bills and on the reverse side scene to make it harder to reproduce. Note the words "USA FIFTY USA 50" on the $50 bill pictured.

Photo: Fred LaSenna for CNBC.com