A Gauguin painting owned by the Tate has been downgraded to the status of a fake, with a leading art institute excluding it from a catalogue of his works. Tahitians, estimated to be worth about ￡15 million, was acquired by the Tate in 1917 and included in its 2010 blockbuster exhibition, Gauguin: Maker of Myth. The unfinished painting was included in a 1964 catalogue raisonné produced by the Wildenstein Plattner Institute in New York.... However, it has been dropped from an updated version of t