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Aquatint Etching
Like etching, aquatint uses the application of acid to make the marks in the metal plate. Where the etching technique uses a needle to make lines that print in black (or whatever color ink is used), aquatint uses powdered resin which is acid resistant in the ground to create a tonal effect. The tonal variation is controlled by the level of acid exposure over large areas, and thus the image is shaped by large sections at a time. Another tonal technique, mezzotint, begins by making a plate surface evenly indented so that it will carry a fairly dark tone of ink. The mezzotint artist then creates his image by smoothing out those areas that he wishes to carry less ink, and thus be lighter in prints. Goya famously took great advantage of aquatint printmaking, in his 'Los Caprichos' (1799).