Once on the margins, older African-American artists are suddenly a hot commodity. They are relishing the attention while dealing with the market’s grueling demands. McArthur Binion, the abstract painter, at Lehmann Maupin Gallery in New York. Underappreciated for decades, his work now sells briskly for up to $450,000. “I’m totally ready for it,” the 72-year-old artist said of his new acclaim.

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