After more than a decade of mixing and kneading dough in his family’s Brooklyn pizzeria, Salvatore Lo Duca recently made a distressing discovery: A key component of their thin-crust pies, bromated flour, contained a suspected carcinogen already banned in much of the world.

So, in the back kitchen of Lo Duca Pizza, the 39-year-old began tweaking the original recipe handed down by his parents — with unexpected results.

“When we started playing around with a different flour, I actually took a liking to it,” said Lo Duco, who runs the shop with his five brothers. “It’s a little more expensive, but the quality is there.”

A looming ban on the additive, potassium bromate, may soon force thousands of pizzerias and bagel shops across New York into a similar transition.

The bill, passed by state lawmakers and awaiting Gov. Kathy Hochul’s signature, has divided dough-makers, triggering fears that even a minor change to long-established baking practices could have dramatic implications for the city’s most iconic foods.