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Organized with the National Gallery of Art in Washington, where it travels in the fall, the show is a blockbuster featuring many of the most-beloved paintings associated with the Impressionist movement.

Another of the experts, Arthur K. Wheelock Jr., former curator of northern Baroque paintings at the National Gallery of Art in Washington, said in an interview that he had been quickly convinced of Rembrandt’s authorship.

Conservationists at the National Archives reached out to colleagues at the National Gallery of Art for tips on specialized cleaning products to use around delicate textiles.

So one wonders what he would make of the news that the National Gallery of Art has just acquired a veritable truckload of his work — some 20 boxes and seven collages from throughout his career.

The Lehrmans’ gift, comprising about half their Cornell holdings, “is major, major, major,” said Harry Cooper, the senior curator and head of modern and contemporary art at the National Gallery of Art.