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Offset printing is the process of printing by indirect image transfer, especially by using a metal or paper plate to ink a smooth rubber cylinder that transfers the ink to the paper. The rubber cylinder gives great flexibility, permitting printing on wood, cloth, metal, leather, and rough paper.
Offset printing, a development of lithography, is based on the principle that water and grease do not mix, so that a greasy ink can be deposited on grease-treated printing areas of the plate, while nonprinting areas, which hold water, reject the ink.


printing plate

 


Printing processes such as offset lithography use printing plates to transfer an image to paper or other substrates. These plates may be made of metal, plastic, rubber, paper, and other materials. An example of metals used in the plates is silver and is called silver plate.

 

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