CNN: The Federal Reserve will begin circulating a new $100 bill Tuesday, with a number of security measures.
The bill was originally due to reach banks in 2011. But three years ago the Federal Reserve announced that a problem with the currency's new security measures was causing the bills to crease during printing, which left blank spaces on the bills.
The new bill has several features designed to make it easier for the public to authenticate but more difficult for counterfeiters to replicate. Those measures include a blue, 3-D security ribbon, as well as color-shifting ink that changes from copper to green when the note is tilted. That ink can be found on a large "100" on the back of the bill, on one of the "100's" on the front, and on a new image of an ink well that's also on the front.