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Combating Counterfeiters: Defense is in the Details

Photo credit: Fred LaSenna for CNBC.com

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Presidential Portrait

The portrait on a genuine U.S. note appears lifelike and stands out distinctly from the background. Counterfeit portraits are usually lifeless and flat and details merge into the background, which is often too dark or mottled.

Pictured: $50 bill featuring President Ulysses S. Grant

Photo credit: Fred LaSenna for CNBC.com