[[Image:Dollarsecurity.jpg|right|250px|thumb|Anti-counterfeiting features on an old [[W:American twenty dollar bill|U.S. $20 bill]]]] Traditionally, anti-counterfeiting measures involved including fine detail with raised [[W:intaglio (printmaking)|intaglio]] printing on bills which would allow non-experts to easily spot forgeries. On coins, ''milled'' or ''reeded'' (marked with parallel grooves) edges are used to show that none of the valuable metal has been scraped off. This detects the ''shaving'' or ''[[W:Coin clipping|clipping]]'' (paring off) of the rim of the coin. However, it does not detect ''sweating'', or shaking coins in a bag and collecting the resulting dust. Since this technique removes a smaller amount, it is primarily used on the most valuable coins, such as gold. In early paper money in [[W:Colonial North America|Colonial North America]], one creative means of deterring counterfeiters was to print the impression of a leaf in the bill. Since the patterns found in a leaf were unique and complex, they were nearly impossible to reproduce.[http://www.librarycompany.org/BFWriter/images/large/3.7.jpg]
