Lithography (from the Greek 'lithos', meaning stone) is a chemical process based on the fact that water and grease repel each other. Traditionally, the design is drawn with a greasy crayon onto a lithographic stone. The stone is dampened with water, which is repelled by the crayon. It is then inked with a grease-based ink, which is repelled by the water and adheres only to the areas covered by the grease crayon. A sheet of paper is placed on top of it and the two are passed through the press together.
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