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MicroDry is a computer printing system developed by the ALPS corporation of Japan. It is a resin-transfer system using individual colored thermal ribbon cartridges, and can print in process color using cyan, magenta, yellow, and black cartridges, as well as such spot-color cartridges as white, metallic silver, and metallic gold, on a wide variety of paper and transparency stock. Certain MicroDry printers can also operate in dye sublimation mode, using special cartridges and paper. ALPS licenced the technology to Citizen (Printiva series) and to Okidata (Oki DP series).

A typical MicroDry printer includes a moving carriage containing the printhead, which is capable of taking cartridges from a rack on the front cover of the machine, printing with them, and returning them to the rack, without human intervention. Printing is normally done one color at a time, printing the entire cyan portion of the page, then retracting the page to print the entire magenta portion, then yellow, then black (or yellow, magenta, cyan, and a protective overcoat, in dye sublimation mode). When multiple spot colors are used in addition to CMYK, the printer can be manually directed to retract the page at the end of the printing cycle, instead of ejecting it, thus assuring that the spot colors remain in registration. Okidata Supplies.