Lithography is the art of printing from stone. The process was invented by Alois Senefelder in 1796, and the fundemental principles that he established have remained unchanged. By writing or drawing with a greasy ink on a specially prepared slab of limestone, the grease is absorbed by the stone and the image thus formed has an affinity for printing ink, while the remaining parts of the stone repel the ink as long as the surface is kept moist with water. Lithographic presses are cylinder…
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