Answer:
A nonreactive saucepan is one that is made from stainless steel, glass, or ceramic materials. So are those coated with Teflon. They're called nonreactive because these materials in contact with the food don't react with acidic ingredients the way copper and aluminum do. Stainless steel, glass, ceramics and Teflon are highly resistant to chemical attack. And as you might expect, different materials have different advantages and disadvantages.