One of the local resturants here in Dallas called Good Eats has a reproduction of his art but The New Yorker featured this one...

In 1978 Andy Warhol and company executed a series of elegant abstractions called Oxidation Paintings . Iridescent, made up of coppery yellow, orange, and green strokes and drips, these canvases seemed to offer the viewer precisely the kind of sensuous enjoyment of paint denied by Warhol's more famous pop images. Such modernist pleasures were upset, however, when it was discovered just what kind of oxidation was involved in the making of these works. Bob Colacello describes the creation of these paintings in his book Holy Terror. "Andy paid Victor [Hugo] to be the collaborator," Colacello writes. "He would come to the Factory to urinate on canvases that had already been primed with copper based paint by Andy or Ronnie Cutrone, who was a second ghost pisser . . . ."

Andy Warhol and the ghost pissers
"These nice older women were asking me how I’d done them and I didn’t have the heart to tell them what they really were because their noses were right up against them."

http://www.arts.ualberta.ca/~aoki/Teaching/objet_a/urine/Warhol/Warhol.htm


About the Artist:

Andrew Warhola (Rusyn: Андрій Варгола, August 6, 1928 – February 22, 1987), more commonly known as Andy Warhol, was an American painter, printmaker, and filmmaker who was a leading figure in the visual art movement known as pop art. After a successful career as a commercial illustrator, Warhol became famous worldwide for his work as a painter, avant-garde filmmaker, record producer, author, and public figure known for his membership in wildly diverse social circles that included bohemian street people, distinguished intellectuals, Hollywood celebrities and wealthy aristocrats. Warhol has been the subject of numerous retrospective exhibitions, books, and feature and documentary films. He coined the expression "15 minutes of fame."

READ MORE AT

http://en.wikipedia.org/wiki/Andy_Warhol