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The back of the new $100 bill.
The key security features in the new $100 bill which is expected to debut on February, 2011 include a 3D security ribbon that goes down the middle of the bill. When tilted up and down, you'll see bells changing to 100s as they move.
The bell inside the ink well will turn from copper to green when tilted.
When you hold the bill up to the light you can see a faint image of Benjamin Franklin in the space on the right.
The numeral 100 on the lower right corner will change from copper to green as the bill is tilted.