Art historian James Cahill claimed that the painting "The Riverbank", a masterpiece from the Southern Tang dynasty, held by the New York Metropolitan Museum of Art, was likely another Chang forgery. The silk the piece is painted on could be carbon dated to help authenticate it, however since there has been some restoration on it -- the border repaired and the painting remounted and reglued -- not only would getting a sample to test be difficult, but there would be no guarantee the sample only contains original material.