Rue de Seine (detail), David Hockney, 1971. Etching and aquatint. Signed in pencil and numbered from the edition of 150. 89.4 × 70.6 cm. Sims Reed Gallery.
The plate is covered with grains of resin called an aquatint ground, which are then fused to the plate, generally by heating. The plate is immersed in an acid bath allowing acid to bite into the entire area, pitted with the resin, creating an overall grainy, tonal effect. This technique is often combined with etching.