A printmaking technique that involves drawing with greasy crayons or a liquid called tusche, on a polished slab of limestone; aluminum plates, which are less cumbersome to handle, may also be used. The term is derived from the Greek words for stone (litho) and drawing (graph). When the greasy image is ready to be printed, a chemical mixture is applied across the surface of the stone or plate in order to securely bond it. This surface is then dampened with water, which adheres only to the blank, non-greasy areas. Oily printer’s ink, applied with a roller, sticks to the greasy imagery and not to areas protected by the film of water. Damp paper is placed on top of this surface and run through a press to transfer the image. In addition to the traditional method described here, other types of lithography include offset lithography, photolithography, and transfer lithography.

Credit: MoMA