mezzotint (process) <p>Intaglio process in which the surface of the plate is methodically roughened with a rocker to produce a dark background; areas may then be lightened using various scrapers; produces a printed image having a continuous tonal range.</p> <p>Source: Art &amp; Architecture Thesaurus</p> <p>http://vocab.getty.edu/page/aat/300053233</p>