From MapHist.com - Glossary of Terms for historical maps

Glossary of Terms
Engraving
By Pierre Joppen
Jul 7, 2004, 08:44

A method of printing in which the image is etched or engraved into the surface of the printing plate and is therefore, recessed below the surface of the plate. Ink is captured in the recesses of the image and is transferred to paper under firm pressure.

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