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Transparency (projection)
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== Printing == Transparencies can be printed using a variety of technologies. In the 1960s and 70s the GAF OZALID "projecto-viewfoil" used a diazo process to make a clear sheet framed in cardboard and protected by a rice paper cover.<ref>{{cite book|last=OZALID Newsletter|title=Electronics Weekly Magazine, November|year=1963|publisher=Electronics Weekly|url=https://www.worldradiohistory.com/Archive-Electronics/60s/63/Electronics-1963-11-08.pdf|access-date=2024-02-25}}</ref> In the 1980's [[laser printer]]s or [[copier]]s could make foil sheets using standard xerographic processes. Specialist transparencies are available for use with laser printers that are better able to handle the high temperatures present in the fuser unit. For inkjet printers, coated transparencies are available that can absorb and hold the liquid ink—although care must be taken to avoid excessive exposure to moisture, which can cause the transparency to become cloudy; they must also be loaded correctly into the printer as they are only usually coated on one side.
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