Louis Brandeis, from Ten Portraits of Jews of the Twentieth Century

In his 1980 series Ten Portraits of Jews of the Twentieth Century, Warhol used his trial proofs for the first time as a formal component of a print edition. Instead of discarding his trial images, such as the above portrait of Louis Brandeis, and their unique color combinations, Warhol issued these prints as a supplement to the published editions. The studio annotated the prints "T.P.." and numbered them in the mode of the standard edition. By editioning his working material to coincide with final edition, Warhol commercialized his process in way previously unseen in the print world.