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New $100 bills: Liberty Bell fades, Independence Hall flipped

It's all about the Benjamins, and their high-tech anti-counterfeiting threads

US Treasury, Federal Reserve and the Secret Service today rolled out a new $100 bill "with advanced technology to combat counterfeiting."

New security features: "the 3-D Security Ribbon and the Bell in the Inkwell." That means printed bells, which change in color "from copper to green when the note is tilted," which also makes the bells "appear and disappear within the copper inkwell."

Took 10 years to figure this out, says US Treasurer Rosie Rios in a statement. Retained from the old $100: the Ben Franklin watermark, and the color-shifting number 100. But Independence Hall has been turned around so you now see "the rear, rather than the front, of the building." Old bills still good.

More for currency nerds at www.newmoney.gov