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Brightly colored powders, shot into the air at running events and some concerts, are designed to breathe excitement into those events. But have you ever wondered how safe those powders are to breathe?

ORLANDO, Fla. — Every race season, a rainbow of runners storm through clouds of colored powder. "It was awesome,” said runner Mimi Wilk. The pigments make for perfect pictures. "It's just a fun run, ...