Final answer:
Drypoint is distinguished from other engraving methods by the use of a hard-pointed needle to incise the plate, creating characteristic burrs that result in a unique, velvety line quality without the use of acid, unlike in etching or aquatint.
Step-by-step explanation:
What distinguishes drypoint from other methods of engraving is the use of a hard-pointed needle to incise the plate, creating a distinctive burr which results in a rich and soft line quality in the final print. Unlike etching that involves using acid to etch the plate and aquatint that creates tonal effects, drypoint relies solely on the physical incision made by the artist. In drypoint, a burin is used to scratch the image directly into a metal plate, typically copper, or more modern materials like plexi-glass. Unlike other intaglio processes such as etching or aquatint, no acid is used in drypoint.
Instead, the direct scratching technique results in raised lines on the plate. These lines create a characteristic 'burr', which yields the slightly blurred edges and rich, velvety appearance of drypoint prints, as seen in artworks like Rembrandt's Clump of Trees with a Vista. This reflects the quality of the final print that is unique to the drypoint method.