Cerography
Cerography or glyphography is a printmaking technique related to engraving, using a layer of wax over a metal substrate. After the image is engraved into the wax, a positive plate is produced through stereotyping or electrotyping. This plate can be used with conventional letterpress equipment.
The word is derived from the Greek κηρός, wax, and γράφειν, to write).
Cerography was invented in the late 1830s by Sidney E. Morse, a son of Jedidiah Morse, and a younger brother of Samuel Morse; it was independently patented in England by Edward Palmer, who primarily conceived of it as an artistic medium. Its primary use, however, was for line drawings, and in particular maps. It was easier than copperplate engraving and allowed lines and printed text to be combined easily in a single plate. It also allowed for color illustration. As compared to lithography and copperplate it had the disadvantage that it could not reproduce fine shading well.
The technique remained popular to the end of the 19th century but was gradually pushed out by photoengraving.
