WHAT IS THE SUPERDOLLAR?
A superdollar (also known as a superbill or supernote) is a very high quality counterfeit United States one hundred-dollar bill, alleged by the U.S. Government to have been made by unknown organizations or governments. In 2011, government sources stated that these "counterfeit bills were in worldwide circulation from the late 1980s until at least July 2000" in an extradition court case.
Today more than 20 varieties of superdollar have been identified by experts; all of them use highest-quality inks printed on a cotton-linen blend and recreate many security features found in the genuine US $100 bill. To combat the phenomenon, the US Federal Reserve issued a new $100 banknote in 2013 that incorporates a blue ribbon with hard-to-replicate holographic features.