Pounce (calligraphy)
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Pounce is the gum Sandarac, mixed with pumice or cuttlefish bone, finely powdered in a mortar and pestle. It is used in fine calligraphy to prevent ink from excessively wicking through paper fibers, as when writing on unsized paper or after an erasure. It also gives tooth to smooth papers. For the same purpose of preparing for ink writing it is used on true vellum as well. When it was more commonly used, with dip pens, it was kept in one of the three bottles of an inkstand the other two being naptha and ink with lead shot.[1]