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Message:: [QUOTE="NOS, post: 25764416, member: 2098"]That is not quite true. The ink used is proprietary. That is a security feature, as was the addition of iron to the ink used to print currency in the early 1980's. The "paper" stock used, which is a combination of cotton and linen that is not available for purchase by the public, is propriety. That is a security feature. The continued usage of the intaglio printing process is a security feature, as are the usage of serial numbers. And finally, unless I missed something, the usage of blue and red fibers in said cotton and linen mixture, which was invented by Benjamin Franklin, is a security feature. I count six security features right there. One dollar bills may have fewer security features than newer higher-denomination notes but they still have plenty of them. They're just not as apparent to the general populous but modern counting machines and bill validators (such as those used by vending machines or at casinos, etc.) do a pretty good job of recognizing most of these not-so-obvious features.[/QUOTE]