Lithography is a printing process that uses an ink & water process to create an image. The positive part of an image is an ink, while the negative image is water. When the plate is introduced to a compatible ink and water mixture, the ink will adhere to the positive image and the water will clean the negative image. This allows for a relatively flat print plate which allows for much longer runs than the older physical methods of imaging (e.g., embossing or engraving).

Read more here: http://en.wikipedia.org/wiki/Lithography

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