Counterfeit Pen
Counterfeit pens
are used to detect
counterfeit
United States
banknotes
. Genuine banknotes are cotton based and don't react with the ink. Counterfeit notes are often made on wood based papers.
Iodine
in the ink reacts to starch in the wood pulp, turning dark to indicating a counterfeit note. Pen manufactures claim over 98% effectiveness
http://www.stopfraud.com/counterfeit_detector_pen.htm
, but is not at all effective with respect to old bills.
http://www.bankersonline.com/security/gurus_sec020204c.html
Some counterfeiters bleach small demoninations and print more valuable bills on the blank paper to evade this test. A
QUICKTEST Pen
is a similar device for testing
Switzerland
and
Euro
banknotes.
http://www.swiss-netshop.ch/4709/?*session*id*key*=*session*id*val*
They are hardly useful, because most counterfeit money is not printed using such outdated techniques.
External links
US Patent 5,063,163
http://www.securityworld.com/surveillance/NS91417.html
B/CS hit with forged five dollar bills
Commonwealth v. Edney
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