aquatint (printing process) <p>An intaglio etching technique in which a metal plate is sprinkled with a finely-powdered resin (asphaltum, rosin, etc.); the plate is heated to melt the resin, then cooled, and placed in an acid bath. The acid lightly etches areas not covered with the resin. The results in a plate with fine pockmarks. The process was invented in the 1760s by J.B. LePrince. Aquatints were popular until the late 1830s.</p> <p>Source: Art &amp; Architecture Thesaurus</p> <p><span class="page">http://vocab.getty.edu/page/aat/300053242</span></p>