How to Detect Counterfeit Money - United States

USA New Currency Notes Have a Security Thread - A polymer thread embedded vertically in the paper to the left or right of the portrait indicates the denomination of the bill. Respectively the words "USA FIVE", USA TEN”, “USA TWENTY”, “USA 50”, “USA 100” , and a flag can be seen from both sides of the notes when held up to a bright light. The polymer thread glows a specific color when UV Light shines on it as follows:

New US$5 thread glows blue. (issued since mid 2000)
New US$10 thread glows orange. (issue since mid 2000)
New US$20 thread glows green. (issued since fall 1998, new series issued in 2003)
New US$50 thread glows yellow. (issued since 1997, new series issued in 2004)
New US$100 thread glows red. (issued since March 1996, new series issued in 2005)

Correct position of the threads:

Important Note: Taking photographs of ultraviolet light causes the UV light to appear as very bright blue and the fluorescence glow to be washed out. The Countercheck Photon UV-1 light produces light with a wavelength of 370 nm, resulting in a very faint white-purple light since almost all of the light produced is ultraviolet and outside the visible spectrum. This results in fluorescence features on bills glowing very brightly, even more so than under blacklight bulbs.

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