Lithograph: A planographic print traditionally done on limestone. The image is drawn onto the stone using greasy lithographic crayons. The stone is then etched/fixed with nitric acid and gum Arabic. This fixes the drawn image as a grease-receptive area and renders the unmarked stone receptive to water. Printing is done by sponging the stone with water (which is rejected by the image area), and greasy printing ink is rolled over the image. The ink adheres only to the image drawn by the artists and is rejected by the wet stone.          
          "Stone lithography was the first printmaking technology that allowed a traditional artist to work using traditional techniques, and to create prints that could rival an original painting in terms of detail, mood and color variations. Stone lithography was popular for about a century during the 1800s, and is still practiced today by artists and lithography studios." <http://www.howstuffworks.com/stone-lithography.htm>          
Rudy Salgado drawing an image onto a stone.
Derek rolling ink onto a stone to print.
Richard Peterson rolling up a stone with
ink to print.
Gregory Page viewing a print after pulling it
from the press.
These pictures were taken at Frogman's Press & Gallery workshops.
For more information on lithography, please visit: http://www.roundravenpress.com/Lithography.html