Copying machines {mimeograph}| can use blue dye pressed onto sheet, which then transfers to other sheets using solvent.
Light reflected from an image can make an electrostatic pattern on a plate, to which carbon particles cling and from which ink transfers to paper, to dry by heating {photocopier}| {xerox}.
Re-photographing a photograph through a glass screen that has 55 to 130 lines per square inch, vertically and horizontally {photoengraving}|, makes a negative that has very small dots.
process
Zinc or copper sheets {plate} with film emulsion receive negative. Light shines on plate to deposit silver. Developing plate and washing with acid dissolves zinc or copper at locations that have no silver. A roller applies ink to plate. Machines {printing press} press paper onto plate, to make heavy, medium, and light dots.
color
Color prints require yellow, red, blue, and black color plates {four-color process}. Art magazines use six plates and colors: yellow, red, blue, black, green, and white.
photographed document {photostat}|.
Photocopying {scanner, computer}| can transfer image to computer file.
Dry copying {xerography} can use electrically charged resin.
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Date Modified: 2022.0225