Method of detecting counterfeit paper currency
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United States of America Patent
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Nov 5, 1991
Grant Date -
N/A
app pub date -
Mar 20, 1990
filing date -
Mar 20, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of detecting counterfeit paper currency includes applying a test solution having an initial color to an area of a paper currency to be tested. After waiting for a predetermined time period, the color of the test area is compared with a predetermined standard to determine if a reaction has taken place, whereby on the application of the test solution to a counterfeit paper currency the net result will be a color change from its initial color to a black coloration and for a genuine paper currency there will be no immediate change in its initial color.
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