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Printer tracking dots, also known as printer steganography, DocuColor tracking dots, yellow dots, secret dots, or a machine identification code (MIC), is a digital watermark which many color laser printers and photocopiers produce on every printed page that identifies the specific device that was used to print the document.
Before the widespread adoption of xerographic copiers, photo-direct copies produced by machines such as Kodak's Verifax (based on a 1947 patent) were used. A primary obstacle associated with the pre-xerographic copying technologies was the high cost of supplies: a Verifax print required supplies costing US$0.15 in 1969, while a Xerox print ...
Enter the Canon Pixma MG2522 all-in-one, currently on sale at Walmart for just $29. You'd be hard-pressed to buy a single ink cartridge for $29, let alone an entire printer.
Xerox was founded in 1906 in Rochester, New York, as the Haloid Photographic Company. [12] It manufactured photographic paper and equipment. In 1938, Chester Carlson, a physicist working independently, invented a process for printing images using an electrically charged photoconductor-coated metal plate [13] and dry powder "toner".
It was claimed that nearly 100 papers could be copied in two minutes with a roller copier. Roller copiers competed with carbon paper technology. It was claimed that a roller copier could make a half dozen copies of a typewritten letter if the letter was run through the copier several times. It could make a dozen copies if the letter was written ...
A spirit duplicator (also Rexograph and Ditto machine in North America, Banda machine and Fordigraph machine in the U.K. and Australia) is a printing method invented in 1923 by Wilhelm Ritzerfeld, which was used for most of the 20th century. The term "spirit duplicator" refers to the alcohols that were the principal solvents used in generating ...