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<p>[QUOTE=&quot;Numbers, post: 1782747, member: 11668&quot;]On U.S. currency, the IR features are on the back side.&nbsp; The green intaglio printing is actually done with two different green inks, one IR-dark and one IR-bright, which look identical in visible light.&nbsp; There&#039;s a vertical stripe about half an inch wide printed in the IR-bright ink, and the stripe is located in a different position on each denomination.&nbsp; Makes it easy for IR scanners to identify denominations (some vending machine currency readers make use of this feature, as do some of the currency readers used by the blind).</p><p>&nbsp;</p><p>This is a relatively new feature; I think it was introduced in 1999 or so.&nbsp; Not all of the 1996-generation &quot;big head&quot; bills have it, but all of the 2004-generation &quot;Kodachrome&quot; bills do.[/QUOTE]</p><p><br /></p>

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