List Price: $16.49 Deal Price: $7.12 You Save: $9.37 (57%)Introducing the new Counterfeit Detector by Sharpie which is specially formulated to detect bad bills. The technology reacts to the presence of a key ingredient present in papers that are not used by the US Treasury. This new marker is effective on all U.S. currency include "new design" bills. The ink marked on a suspect, counterfeit bill will change in color from golden brown to blue-black.Expires May 13, 2012

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