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Yellow dots on white paper, produced by color laser printer (enlarged, dot diameter about 0.1 mm) 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 ...
Color error: Stamp is printed in the wrong color(s). Paper error: Stamp is printed on the wrong type of paper which, e.g., may have a different watermark or color than intended. Perforation error: Perforations are missing on one or several sides or put in the wrong place (e.g. diagonally). As perforations may be removed by cutting them off ...
A perspective view of a dandy roll in accordance with the invention of a conventional paper-making machine incorporating watermarks into the paper. Traditionally, a watermark was made by impressing a water-coated metal stamp onto the paper during manufacturing. The invention of the dandy roll in 1826 by John Marshall revolutionised the ...
True watermark. A true watermark is a recognizable image or pattern in paper that appears lighter or darker than surrounding paper when viewed with a light from behind the paper, due to paper density variations. A watermark is made by impressing a water coated metal stamp or dandy roll onto the paper during manufacturing.
"LOAD" is an instruction to refill the paper tray. "LETTER" is the standard paper size used in the United States and Canada. Thus, the message is instructing the user to refill the paper tray with letter-sized paper. Other messages that might be seen include "MP LOAD LEGAL", meaning the "MP" (multi-purpose) tray needs to be filled with legal ...
An invert may be characterized as an "inverted center" or "inverted frame" when the underlying paper is watermarked or otherwise carries a basic orientation. It is possible for a single-color stamp to be inverted relative to watermark, but this is called an " inverted watermark " rather than an "inverted stamp".
Barack Obama's birth certificate on security paper.. Security paper is a paper used in security printing that incorporates features that can be used to identify or authenticate a document as original, e.g., watermarks or invisible fibres in paper, or features that demonstrate tamper evidence when fraud is attempted, e.g., to remove or alter print such as amounts or signatures on a cheque.
This is done to distinguish stamps with the same color, perforation gauge and denomination but which were printed on paper with different watermarks or without any watermarks—i.e., the only way to positively distinguish a 3-cent, 1908 issue, with double-line watermark, from a 3-cent, 1910 issue, with single-line watermark, is to test for ...