ART

Dirty Art: The J. Paul Getty Museum has paid $3.6 million for a German painting that once accumulated soot in a cellar. “Walk at Dusk,” a melancholy depiction of a man in a wintry landscape, was painted by 19th-Century master Caspar David Friedrich. The unidentified German seller had stored the painting in his basement, where it languished for several decades. The painting is the first German 19th-Century work bought by the Getty. The only other Friedrich displayed in a U.S. museum is in the Kimbell Art Museum in Fort Worth.