(Image credit: via The Art Newspaper)

Solving a 40-year mystery, a painting that was thought to be a work of Léger was proved a fake. Part of the Peggy Guggenheim collection in Venice, the work was supposedly created during the artist's 1913-1914 “Contraste de formes” series. By testing radiocarbon levels, it was determined that the canvas could not have been made prior to 1959.

Nuclear analysis proves Venice Guggenheim’s Léger is a fake | The Art Newspaper