Mr. Obama’s graying is still of the flecked variety, and appears to wax and wane depending on when he gets his hair cut, which he does about every two weeks. His barber, who goes by only one name, Zariff, takes umbrage with bloggers who alternately claim Mr. Obama, 47, is dyeing his hair gray (to appear more distinguished) or dyeing it black (to appear younger). “I can tell you that his hair is 100 percent natural,” Zariff said. “He wouldn’t get it colored.”