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A leading Rembrandt scholar, Gary Schwartz, has concluded that a portrait titled 'Old Man with a Gold Chain' and dated to the early 1630s is, in fact, an authentic work by the 17th-century Dutch master. The painting, which has been on loan from Sir Francis Newman, a Cambridge-based entrepreneur, has been reunited with its counterpart at the Art Institute of Chicago.Each of the paintings depicts an older man wearing a gold chain and a plumed hat. For almost four centuries, the two portraits have been separated, with the Chicago version considered the undisputed original. The Newman portrait, slightly smaller and painted on canvas, was previously labelled as a 'copy' by an artist in Rembrandt's workshop.However, Schwartz's research suggests that both paintings are by Rembrandt. He argues that the quality of the brushwork and the practice of Dutch artists creating replicas of their own paintings support this conclusion. In 1699, a French contemporary of Rembrandt noted that it was common for Dutch artists to repeat their works.X-ray and infrared imaging of the Chicago picture revealed underdrawing and adjustments to the man's costume, which were absent from the Newman canvas. This led Schwartz to conclude that the Newman painting was not a workshop reproduction but an original work by Rembrandt.The Hamilton Kerr Institute at the University of Cambridge found that the UK version's canvas and colour pigments matched those used by Rembrandt and his studio. If confirmed as a Rembrandt, the painting will go to a museum, according to Newman.