Lithography is a form of printing based on the principle that oil and water do no mix, but reject each other.
A drawing is made on an absorbent stone using an oil based ink. Then the stone is washed with water, then it’s inked and the watered parts repel the ink while the drawing part attracts it. Afterwards it is printed on paper.
This process was invented by an Austrian, Aloys Senefelder, in the 1790’s and has proved to have been very popular.
One of the leading lithographic artists of our time includes Barnett Freedman.