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Sometimes the drawing is made on paper and transferred to a heated stone by pressure. This is known as a transfer lithograph and does not require the artist to reverse his or her drawing. Next, the surface of the stone untouched by grease is desensitized to it, and the portions drawn upon are fixed against spreading by treatment with a gum arabic and nitric acid solution. The grease has now penetrated the stone, and the drawing is washed off with turpentine and water. The stone is ready to be inked with a roller and printed, but it must be kept moist. The printing requires a special lithographic press with a sliding bed passing under a scraper.
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