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Treasury Goes High-Tech With Redesigned $100 Bills
Hugh Pickens writes "AP reports that as part of an effort to stay ahead of counterfeiters, the Department of the Treasury has designed a high-tech makeover of the $100 bill with a disappearing Liberty Bell in an inkwell and a bright blue security ribbon composed of thousands of tiny lenses that magnify objects in mysterious ways. The new blue security ribbon will give a 3-D effect to the micro-images that the thousands of lenses will be magnifying. Tilt the note back and forth and you will see tiny bells on the ribbon change to 100s as they move. Tilt the note side to side and the images will move up and down."
The idea is that the banks gradually remove them from circulation by sending them in to be destroyed and replaced with modern currency. It takes a while, but eventually the old bills become uncommon enough that their use becomes more suspect. For example, this is still valid us currency:
http://en.wikipedia.org/wiki/File:One_US_dollar_1917.jpg
but if someone tried to pay me with one, I think I'd be a bit suspicious. Especially if they tried using a whole bunch of them at once. Counterfeiters don't just spend a $20 here and a $20 there...they are in it big time and have loads of bills they need to unload.