A new hi-tech $100 banknote comprising several new security features has been issued by the Federal Reserve.
The new banknote includes a blue 3D security ribbon and a bell and inkwell logo that authorities say are particularly difficult to replicate.
These combine with traditional security features, such as a portrait watermark and an embedded security thread that glows pink under ultraviolet light.
The 2010 design was delayed because of “unexpected production challenges”.
The 3D security ribbon – which is woven into the note, not printed on it – features images of 100s that change into bells and move upwards or sideways depending on how you tilt the paper.
Tilting also reveals a green bell within a copper-coloured inkwell to the right of the blue ribbon.
In addition, the “100” number in the bottom right-hand corner shifts from copper to green.
The redesigned banknote, which features a portrait of Benjamin Franklin, also includes raised “intaglio” printing that gives the notes a distinctive feel, and microprinted words that are difficult to read without magnification.
Over a decade of research and development has gone into the new note, the Fed said, in a joint project with the Secret Service and the Department of the Treasury.
Advances in design software and high-resolution copying and printing have made it easier for counterfeiters to print fake money and harder for retailers to spot the forgeries.
US authorities say that $100 bill is the most counterfeited of all US banknotes, but accurate figures for the total value of counterfeit cash in circulation are hard to come by.
The Secret Service estimates that counterfeit bills account for less than 0.01% of the $1.1 trillion of US money in circulation.
It says about $80.7 million of counterfeit currency changed hands domestically in 2012, and about $14.5 million abroad.
The authorities seized $9.7 million in counterfeit cash before it could make it in to the US money supply, and seized $56.8 million abroad in 2012.
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