Using an etching needle, an artist scratches an image onto a metal plate covered with wax. This plate is then submerged in acid, which eats into the metal exposed by the scratched lines. The longer the plate is left in the acid, the deeper and darker the line will be. The plate is cleaned, inked, and cleaned again, leaving only the incised lines filled with ink. Dampened paper and a protective cloth are placed over the plate, which is squeezed through an etching press — the pressure forcing the paper into the etched lines to pick up the ink. The image is printed in reverse, and an indentation, known as the ‘plate mark’, is left by the plate’s edges.