As long as you make sure you don't scratch the aluminum pot when you brush it, you can still use it to make soup! ~It's okay if you scratch the aluminum pot, just make sure the aluminum shavings don't get eaten and you'll be fine! ~Iron pots and pans are good from a health standpoint, but have you noticed? We now use a lot of iron pots and pans are made of recycled iron, especially easy to rust, this is the factory in order to save iron raw materials, the rust on top of the iron reduced to iron, (melting with sodium fluorosilicate) but this recycled iron is very easy to rot again! ~But this kind of regenerated iron is very easy to rot again! ~In other words, there are no really safe pots and pans nowadays, and the non-stick paint on your rice cookers, pie pans, and non-stick pans, do you know that? That's highly toxic! ~Maybe you all use non-stick pans? Aluminum pots and pans are quite safe now, and aluminum pots and pans for soup soup is white, not like iron pots and pans like a little mixed! ~ partial black, the hotel soup basically did not use the iron pot, first of all, color and flavor in the color is gone, it must be aluminum pot soup, how to choose, you have a number of it?