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Last updated on June 3, 2012 at 13:09 EDT
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Measuring Trace Amounts of TNT on a Fingerprint

March 13, 2010

The ridges of a single fingerprint can be seen against an orange background. As a potential is applied, trace amounts of TNT come into view, ranging in color from bright yellow dots to black, depending on the concentration. Credit: NJ Tao, Biodesign Institute at Arizona State University