"I'm for mechanical art," said Andy Warhol (1928-87). "When I took up silkscreening, it was to more fully exploit the preconceived image through commercial techniques of multiple reproduction." Printmaking was a vital artistic practice for Warhol. Prints figure prominently throughout his career from his earliest work as a commercial illustrator in the 1950s to the collaborative silkscreens made in the Factory during the 1960s and the...