This section is from the book "The Home Cyclopedia Of General Information", by Charles Morris. Also available from Amazon: Home Cyclopedia of Necessary Knowledge.
[Du.] A picture made from an etched plate, chiefly copper. In etching, the plate is covered or dabbed with a varnish, and is scored or scratched with a needle, so as to form the drawing; it is then covered with nitric acid and water, which bites the metal in the lines laid bare.
 
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