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The slab of stone is ground to a level surface, which may be of coarse or fine texture as desired. The drawing is made in reverse directly on the stone with a lithographic crayon or ink that contains soap or grease. The fatty acid of this material interacts with the lime of the stone to form an insoluble lime soap on the surface, which will accept the greasy printing ink and reject water. Accordingly, those parts of the stone that have been drawn upon have an affinity for ink.
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