> Cast iron is 100% iron.

plenty of cast irons have all sorts of things mixed in them. i don't think anyone particularly cares to use pure iron, because additives make the process easier.

if your pan manufacturer will even tell you which kind they used, you can check matweb for the composition.

some of them include chromium, nickel, molybdenum, etc.

Yes that's true, but compared to stainless and carbon steel it may only contain trace amounts of the metals that are the focus of this study.

Everything in the study is trace amounts!

I don't think they're really comparable though. For example: Stainless steel contains 10.5%+ chromium. Carbon steel contains up to 10.5%. Steel (with a non-trace amount of chromium in it) ends up leeching trace amounts of chromium into food. Some cast iron probably has trace amounts of chromium in it, but far less than the 10%+ in steel.

This may also leech chromium into food, but most likely at an even further insignificant amount. It's not part of the study and I am not a chemist, so I don't want to make a conjecture.

Chemistry is complex enough that layman cannot make any assumptions. For all we know stainless steel and carbon steel have higher content than the cast iron, but leach less because it's far more stable.

Doesn’t chrome and moly make it stainless?

It’s the chromium. Cookware usually has nickel too. When a pan is advertised as 18-8, they mean roughly 18%Cr-8%Ni. Basically the same as 304 stainless steel. You have molybdenum additions in something like 316 stainless steel.

I think it depends on the amount, though I'm no expert.

Cast iron is not 100% iron. It contains carbon and silicon and usually other alloying agents and impurities.

Well true, but compared to stainless and carbon steel it contains trace amounts of the metals that are the focus of this study.

Can anyone just admit they were wrong? Ffs.

lol You're on a website catering to people who dislike having others prove them wrong and will stretch "technically correct" as far as possible, in the face of all else. If computers didn't exist, they'd be lawyers. If lawyers didn't exist, they'd be clergy.

I think you just won HN.

Lots do. Not all. Intellectually honest and educatable people hang out here too. But you’re understood.

I don’t expect anything to be perfect. Maybe just some metamorphic rocks that have been heated by coals that I can roast my food in.