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OPTICAL SECURITY FEATURES ON U.S. CURRENCY<br />
Fluorescent Security Strip On Twenty Dollar Bill.Under UV light, the thread glows green.  Luminescence caused by the absorption of radiant energy (such as ultraviolet light) and ceases as soon as the radiation causing it ceases is known as fluorescence.

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OPTICAL SECURITY FEATURES ON U.S. CURRENCY
Fluorescent Security Strip On Twenty Dollar Bill.Under UV light, the thread glows green. Luminescence caused by the absorption of radiant energy (such as ultraviolet light) and ceases as soon as the radiation causing it ceases is known as fluorescence.

Copyright:© 2003 Jeff J. Daly - Fundamental Photographs

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