Once governments and banks, not private firms, began to produce paper currency, watermarks took on new significance as a means of deterring counterfeiters. When the Governor and Company of the Bank of ...

Watermarks were first used in the late thirteenth century in the handmade papers of Italy. They have long been used to mark important documents, and have appeared on a variety of foreign currency.

Three-dimensional images, watermarks, and color-shifting ink provide clues as to whether money is fake. How Problematic Is Counterfeiting? The U.S. dollar is the world’s most popular currency .

Newer U.S. currency designs found on newer $10, $20, $50, ... The watermark on bills $10 and higher will also match the large portrait. The $5 note has two watermarks, ...

In the US, cross-industry group the Coalition for Innovative Media Measurement (CIMM) has launched an action plan to ...

The currency also has certain "iridescent" features that are visible when the note is held at an angle. Some of the runner-ups for 2011's best new banknote were the Philippines Central Bank and ...

The thread is visible from both the front and back of the note, says the U.S. Currency Education Program. Tilt the bill to see if the number 100 in the lower right corner changes from copper to green.