Prints taken from a drawing done on polished limestone or zinc or aluminum plates. The drawing is done with greasy crayons, pens or pencils. A solution containing gum arabic and dilute nitric acid is washed on the stone (or plate). This solution fixes the grease in place. The entire plate surface is washed with water and then inked. Print paper is applied and sent through a press, transferring a mirror image of the stone (or plate).