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Lithography originally used an image drawn (etched) into a coating of wax or an oily substance applied to a plate of lithographic stone as the medium to transfer ink to a blank paper sheet, and so produce a printed page.
In modern lithography, the image is made of a polymer coating applied to a flexible aluminum plate. It uses simple chemical processes to create an image. For instance Von Miller Womens Jersey , the positive part of an image is a water-repelling hydrophobic substance, while the negative image would be water-retaining hydrophilic Thus, when the plate is introduced to a compatible printing ink and water mixture, the ink will adhere to the positive image and the water will clean the negative image. This allows a flat print plate to be used Authentic Von Miller Jersey , enabling much longer and more detailed print runs than the older physical methods of printing (e.g., intaglio printing letterpress printing. To print an image lithographically, the flat surface of the stone plate is roughened slightly鈥攅tched鈥攁nd divided into hydrophilic regions that accept a film of water, and thereby repel the greasy ink; and hydrophobic regions that repel water and accept ink because the surface tension is greater on the greasy image area Von Miller Jersey , which remains dry. The image can be printed directly from the stone plate (the orientation of the image is reversed), or it can be offset by transferring the image onto a flexible sheet (rubber) for printing and publication.
As a printing technology, lithography is different from intaglio printing (gravure), wherein a plate is either engraved etched or stippled to score cavities to contain the printing ink; and woodblock printing and letterpress printing, wherein ink is applied to the raised surfaces of letters or images. Most types of books of high-volume text are printed with offset lithography the most common form of printing technology. Etymologically, the word lithography also denotes photolithography, a micro fabrication technique used to make integrated circuits and microelectromechanical systems, as such are more technologically akin to etching than lithography#7# printing from a stone plate.