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PigeonGuru (talk | contribs) →Design Flaw: changed the wording a little- however it would be better if the source is to be found |
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====False positives====
The effectiveness of the pens may be affected by external methods. Simply having a banknote pass through laundry, depending on the soaps and bleaches used, can cause a bill to fail the test when it is otherwise accepted. 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 dried lemon juice on it will
==See also==
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