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|___location= [[Springfield, Missouri]]
}}</ref> although [[Federal Reserve Note#Post-2004 redesigned series|changes to the currency since 2004]] have made this method easier to detect. This is one reason that many currencies use different sized notes for different denominations.
====Design Flaw====
The effectiveness of the pens may be skewed- one way or the other. Simply having a banknote passing through laundry, depending on the soaps and bleaches used, can cause a bill to fail the test when it is otherwise OK. Additionally, it was discovered almost immediately that changing the acidity of a note, or most any other piece of paper, a napkin, typical typing paper, cardboard, et cetera, with lemon juice, will cause a false positive, that is, a place mat in a restaurant with lemon juice on it will appear to be a valid banknote.
==See also==
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