The technique of lithography was discovered about 1796 by Johann Neponuk Aloys Senefelder, an aspiring Czech playwright. He is said to have copied his mother's laundry list on to a piece of limestone, using a wax pencil. When he accidentally spilled water on the stone, he noticed the waxed portion did not become wet . Sensefelder realized that the same principle would enable printing ink to be selectively transferred to paper or cloth. The process he developed and patented in 1801 marked a major development in the history of printing.
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