Counterfeit 

History

(rough notes) two classes of counterfeiting - one to deceive as to the content (gold coins, pharmaceuticals) and one to deceive as to the source (paper currency, software)

Anti-Counterfeiting Measures

Traditionally, anti-counterfeiting measures involved including fine detail 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 clipping (paring off) of the rim of the coin. However, it doesn't detect sweating, or shaking coins in a bag and to collect the resultant dust. Since this technique removes a smaller amount, it is primarily used on the most valuable coins, primarily gold.

In the late twentieth century advances in computer and photocopy technology made it possible for people without sophisticated training to easily copy currency. In response, national engraving bureaus began to include new more sophisticated anti-counterfeiting systems such as holograms, and inks whose colors changed depending on the angle of the light.

See also: Secret Service, Currency

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