Andy Warhol Art Authentication Board

An Andy Warhol silkscreen of dollar bills was sold at Sotheby's in New York for 43.8 million dollars after a dramatic bidding war."200 One Dollar Bills," a gray and black work showing 200 life-sized images of dollar bills, was estimated to sell for eight to 12 million dollars.And a Warhol self-portrait estimated at one to 1.5 million dollars sold for 6.1 million dollars, a fairy tale ending for a work that was hidden away in a cupboard for 42...