Assertion: copperplate engraving | /r/HasProperty | exposed to acid
Facets:
value: in the variety of etching
type: OTHER
Source sentences:
text: In the variety of etching known as aquatint, a copperplate is exposed to acid through a layer of melted granulated resin, leaving an evenly pitted surface that yields broad areas of tone when the grains are removed and the plate is printed.