Authentication Wars: She Bought A Chagall. Years Later Sotheby’s Suggests She Sell. Panel Says Destroy It

To Ms. Clegg’s dismay, the expert panel in Paris declared her Chagall to be fake, held onto it and now wants to destroy it. When she complained to Sotheby’s, the auction house said there was little it could do, saying its guarantee of authenticity was good only for a time. – The New York Times