... the pans are likely not “nontoxic” some independent testing and research suggests. Nor are they even “ceramic” – at least not in the way the public broadly thinks of ceramics. Now, regulators are investigating some of the pan sellers’ claims.

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The seasoning on cast iron is polymerized oil and it's chemically bonded to the iron. You're only really going to be removing the seasoning if you're using abrasives or scrubbing too hard with steel wool or something like that.

https://www.seriouseats.com/the-truth-about-cast-iron#toc-myth-4-dont-scrub-with-soap

Any loose bits of black gunk that are coming off while you're cleaning it with a sponge or a scrubby are just burnt food.

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