Cottage and Boundary Post on the Spaarndammerdijk (‘L’Obélisque’ [detail]), Rembrandt Harmensz. van Rijn, c. 1650. Etching, drypoint and sulphur tinting. 84 x 162 mm. C.G. Boerner.
As in an engraving, the drypoint needle draws the image directly onto the plate. The residue copper is left on the side of the etched lines, which then collects the ink, creating a furry effect called burr.