this post was submitted on 07 Jun 2025
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Do magnetic test, put a magnet to it, see if it sticks. If it passes the magnet test, then you know it's either carbon steel or magnetic stainless. If it fails, you need to find something that is harder than aluminum, but softer than steel, like an actual piece of copper. Scratch someplace out of the way with the soft copper, if the metal is scratched by the copper, you know that the metal is softer than the copper, and that rules out stainless steel. The scratch test isn't super reliable because some aluminum alloys are significantly harder than copper, but it's better than nothing If you don't have chemical tests available.
Good luck in your search. The Italians used to make quite a few kitchen implements out of aluminum, so it is possible that it is aluminum. I have an old Bialetti Moka that is aluminum.
So, unfortunately it seems to have failed the magnet test. (Had to check what fail and pass were for that lol)
Interestingly though, the lid of it is magnetic. And I was only using what I had at my friend's house, which were small basic fridge magnets.
I read it's maybe possible it's still not aluminum just because it didn't stick to a magnet? I've got some stronger magnets at home but it will be a few days still before I can test that.
And I couldn't find anything which was pure copper, save for finding and stripping a wire somewhere.
Thank you very much for your help here. It has been incredibly beneficial for this search.
I will continue looking for strong magnets just in case, as well as reading where I can to see if anything says what else it could be.
I may be at the end of what I can do outside of testing a sample of the material itself, but if anything comes to mind at any point, please feel free to toss it here. I'll be checking back for sure as well as updating with anything I find.
Thanks again!
Not all stainless steel alloys contain enough iron to ferromagnetic, so the magnet test only proved that your lid is ferro. Good luck with it.