Engraving (burin)
Goya used engraved lines (also called burin) to embellish the smoke from the exploding firecrackers in Banderillas de fuego (Banderillas with firecrackers) (See figs. 13 and 17). The lines are created with a burin, a tool made from a triangular shaped length of metal (such as steel) with one end mounted in a wooden handle while the cutting end is angled and lozenge shaped. (See fig. 15). The tool is pushed away from the body, dislodging little ribbons of copper from the surface of the plate in the process. (See fig. 16).
The tool creates a ‘v’ shaped gouge in the copper and to finish a line it is angled towards the surface to exit the copper. This action and the shape of the tool produces a tapered end at the termination point of each line and these can be used to distinguish engraved from etched lines.