The U.S. Treasury plans on replacing the current $20, $50, and $100 bills with subtle colored backgrounds in the new bills. The $20 bills are due out by fall 2003: the $50 and $100 bills are due out 12 to 18 months later. For now, there are no plans to change the lower amount bills, because high-tech counterfeiters seldom target the smaller denominations.
The new colored ink is supposed to be color shifting, where the shade of color will change when the bill is tilted. They are also adding new security threads that will glow under ultraviolet light.
For those of you who didn't know already, here are the current efforts used on bills except $1 and $2:
- Presidential protraits were enlarged and moved off center
- Watermark of presidents face inserted, visible when held to light
- Color shifting ink used in number on lower right of bill, when magnified, the ink sparkles
- Polymer thread running vertical in bill, with letters "USA" and the denomination of the bill which glows red under UV light source
- Portraits now have concentric fine lines making it diffucult to photocopy
- Micro printed words were added around the face on clothing, or the scroll work around the portrait, that will usually blur if photocopied or scanned (although some new scanner technology is now defeating the micro printing)
All U.S. currency is printed on a special process paper, that is actually 80% linen, and has a cross grain weave, giving it a unique feel from regular paper and easily folded in either direction. The paper is designed specially for the U.S. Treasury and some say the process is more closely guarded than the plates. There are also small red and blue fibers in the paper, that when near the surface and visible, can be worked loose.
Despite the current efforts, $47.5 million of counterfeit bills were seized in the U.S. in 2001. 39% of that was computer generated.
And now you know more about U.S. currency than you ever wanted to.
