This lithograph was drawn by the Professor of Printmaking at the Royal College of Art in London, showing the range of equipment used to make lithographs today. Lithography is a printing technique that depends on the fact that grease and water do not mix. The design is drawn onto to the printing surface. The areas to be printed are covered with grease, while the blank ones are moistened. When greasy ink is applied to the whole printing surface it clings to the greasy areas, but not to the wet ones. The ink is transferred from the printing surface to the paper by pressure.