Yes. Anodized aluminum (like Calphalon), stainless or stainless-lined, non-stick coatings, enamel linings, glass, ceramic and pottery (glazed or unglazed) are all non-reactive. Reactive pans are cast iron, unlined copper (used for candymaking), bare (unanodized) aluminum, and bare steel (like woks) However, depending on how you clean it, the anodized layer on Calphalon will wear off in ten to twenty years.So, a non-reactive pan can eventually become reactive.
(Although, I have some 20-year-old Calphalon commercial cookware that shows no sign of losing its anodized surface). The main rule is never to use oxidizing cleansers and that includes most automatic dishwasher detergents--you have to wash it by hand Calphalon stopped making the commercial hard-anodized stuff several years ago, although there's still a lot of it out there. The new "Calphalon One" stuff is all non-stick coated, now.
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