LITHOGRAPHY

planographic printing process that makes use of the immiscibility of grease and water. In the lithographic process, ink is applied to a grease-treated image on the flat printing surface; nonimage (blank) areas, which hold moisture, repel the lithographic ink. This inked surface is then printedeither directly on paper, by means of a special press (as in most fine-art printmaking), or onto a rubber cylinder (as in commercial printing). The process was discovered in 1798 by Alois Senefelder of Munich, who used a porous Bavarian limestone for his plate (hence lithography, from Greek lithos, stone). The secret of lithographic printing was closely held until 1818, when Senefelder published Vollstndiges Lehrbuch der Steindruckerey (A Complete Course of Lithography).