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In an intaglio print, the engraved lines print black. Wood engraving is a relief printing technique, with the images made by carving into fine-grained hardwood blocks. Ink is rolled onto the surface of the block, dry paper is placed on top of the block and it is printed either by rolling both through a press, or, by hand, using a baren to rub ...
The FIM is a set of vertical bars printed on the envelope or postcard near the upper edge, just to the left of the postage area (the area where the postage stamp or its equivalent is placed). The FIM is intended for use primarily on preprinted envelopes and postcards and is applied by the company printing the envelopes or postcards, not by the ...
Initially, paper was ruled by hand, sometimes using templates. [1] Scribes could rule their paper using a "hard point," a sharp implement which left embossed lines on the paper without any ink or color, [2] or could use "metal point," an implement which left colored marks on the paper, much like a graphite pencil, though various other metals were used.
Relief printing is a family of printing methods where a printing block, plate or matrix, which has had ink applied to its non-recessed surface, is brought into contact with paper. The non-recessed surface will leave ink on the paper, whereas the recessed areas will not.
The machine used scanners to detect the graphite lines and to face the letters so that the stamp was always in the top right corner. The machine could also sort the letters according to the number of graphite lines on the stamps so that fully paid and printed matter stamps were separated. The machine then cancelled the letters.
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 ...
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The thread is a difficult feature to counterfeit, but some counterfeiters have been known to print a thin grey line or a thin line of varnish in the area of the thread. [citation needed] Security threads can also be used as an anti-counterfeiting device in passports. Those are generally made of plastic and contain microprinting.