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An etching plate is covered with a fine layer of resin and then immersed in acid, which bites through the resin, causing tiny pits on the surface of the plate. When printed, a fine, grainy tone is apparent. Lighter tones are created by using acid-resistant varnishes, darker tones by longer exposure to the acid. English painter Thomas Gainsborough experimented with aquatint, but the first artist to become proficient in the technique was J B Le Prince.