Lithography involves the drawing of a design on to a surface using an oil based material. The surface is kept wet whilst it is inked up using an oil based ink. The ink adheres to the applied oil based marks but is repelled by the water found in other areas of the surface. Paper is then placed on the surface, which is put through a printing press in order for an impression to be made. Aluminium and limestone are two surfaces often used in lithography printing.