Watermarks, an ancient craft
A roll of currency paper moves between paper making machines at Crane & Co.
The latest techniques used to defend against counterfeiting are rooted in very old craftsmanship.
Watermarks have been in common use since the late 13th century when they were used to mark important documents and stationery. They are created by varying the paper's density during the manufacturing process. The image of Benjamin Franklin is embedded in the new $100 bill.
NEXT: Crane's heritage
Last updated October 22 2010: 12:40 PM ET
Meet the new Benjamin
