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Rachael Ray and other food celebrities are speaking up in defense of nonstick pans. The actor Mark Ruffalo, who starred in a movie about the risky chemicals, is criticizing them.

By Hiroko Tabuchi

Rachael Ray. Marcus Samuelsson. David Chang.

These celebrity chefs are joining forces, but not for a new restaurant or cooking show. They are teaming up to defend the use of “forever chemicals” in pots and pans.