A perpendicular angle will leave little to no burr, while the smaller the angle gets to either side, the larger the burr pileup. The size or characteristics of the burr usually depend not on how much pressure is applied, but on the angle of the needle. A larger burr, formed by a steep angle of the tool, will hold a lot of ink, producing a characteristically soft, dense line that differentiates drypoint from other intaglio methods such as etching or engraving which produce a smooth, hard-edged line. The lines produced by printing a drypoint are formed by the burr thrown up at the edge of the incised lines, in addition to the depressions formed in the surface of the plate. Mary Cassatt, Woman Bathing, drypoint combined with aquatint, 1890–1.
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