Authoritytgm007726
https://www.loc.gov/pictures/collection/tgm/item/tgm007726
tgm007726Scope NotePrints that faithfully imitate photographs or other continuous tone originals. Hand-pulled prints from plates with an aquatint grain have an irregular pattern of dotting; prints from screened gravure plates have a regular pattern of dots but, unlike halftone prints, ink varies in density. Introduced in 1879.
