Planographic printing means printing from a flat surface, as opposed to a raised surface (as with ) or incised surface (as with intaglio printing). and offset printing are planographic processes that rely on the property that water will not mix with oil. The image is created by applying a tusche (greasy substance) to a plate or stone. The term lithography comes from litho, for stone, and - graph to draw. Certain parts of the semi-absorbent surface being printed on can be made receptive to ink while others (the blank parts) reject it.
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