Editing Quickstartguide:Litho (section)

== Removing the image ==
* grind the stone with pumice to remove the ink on the image
* grind two stones together with sand and water between the stones in an 8-shaped pattern. The mixture of water and sand is when the top stone rolls over the sand particles but does not touch the bottom stone. I.e., there needs to be a layer of sand that covers the full bottom stone and enough water to make the grinding go smoothly. Don't put pressure on the top stone, it's weight should do the work.
 * grind until you don’t see the image anymore. Bevel the edges of the stone with the stone file.