What is the difference between an offset lithograph and an original lithograph?

The difference between an offset lithograph and an original lithograph is that the former is made using the other. To produce an original lithograph, a printmaker begins by drawing on or painting on a stone surface with an oil-based substance. The stone is then covered with water, which is repelled by the oily areas. Oil-based ink is then applied to the wet stone, adhering only to the oily image. The stone is then covered with a sheet of paper and run through a press. An offset lithograph is a copy of an original lithograph produced with mechanical processes, usually without the artist's involvement. On 1stDibs, explore a collection of lithographs and other art prints.