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Older ink erasers are therefore small knives designed to scrape off the top few microns of a sheet of paper, removing the ink that had penetrated. In concert with bladed ink erasers, an eraser similar to those at the end of pencils was also used, with additional abrasives, such as sand, mixed into the rubber.
The printing depends on the smooth flow of ink, which can be hindered if the ink begins to dry at the print head, as can happen when an ink level becomes low. Dried ink can be cleaned from a cartridge print head using 91% denatured isopropyl alcohol (not rubbing alcohol). [5]
For example, Canon and some HP inkjet printers incorporate a replaceable print head which eventually fails. However, the high cost of a replacement forces the owner to scrap the entire device. [27] Pentalobe screws used in an iPhone 6S. Critics have argued that Apple's use of pentalobe screws in their newer devices is an attempt to prevent the ...
As the transfer pad lifts away, the tacky ink film inside the etched artwork area is picked up on the pad. A small amount of ink remains in the printing plate. As the transfer pad moves forward, the ink cup also moves to cover the etched artwork area on the printing plate. The ink cup again fills the etched artwork image on the plate with ink ...
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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.