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The Federal Reserve began supplying banks on Tuesday with redesigned $100聽bills that incorporate advanced anti-counterfeiting features, the U.S. central bank said.

The notes, which retain the image of American statesman and scientist Benjamin聽Franklin, include two new security features - a blue three-dimensional security ribbon with images of bells and 100s, and a color-changing bell in an inkwell, the聽Fed聽said in a statement.

The bills, known as Benjamins, also keep security features from the previous design, such as a watermark.

"The new design incorporates security features that make it easier to authenticate, but harder to replicate," said Federal Reserve Board Governor Jerome Powell said in a statement.

The security features will let users verify the notes' authenticity more easily, he said.

U.S. officials have said the $100聽note is the most frequently counterfeited denomination of U.S. currency outside the聽United States聽due to its broad circulation overseas. In the聽United States, the $20聽bill聽is the most frequently counterfeited note.

Benjamins are the highest-denominated notes issued by the Federal Reserve, since the聽United States聽stopped issuing $500, $1,000 and $10,000 notes in 1969.

The new bills have been in development since 2003.

People with old bills do not need to trade them in for new ones since all designs of U.S. currency remain legal tender, the聽Fed聽said.聽