Wow friends, I feel pretty dumb about this! I was thrilled to find this huge pot at such a cheap price, and the seller insisted it was stainless, but now I realize that you are all right that it's most likely aluminum. After reading these responses I checked some of the other posts(on this and other websites), and found that it is not all that uncommon to be confused trying to i.d. aluminum or stainless. Even some metalurgy sites hint at confusion. Nevertheless, I did enter the first 2 brews I made in this pot(my first all grain beers ever)in a brewing competition, and won second place with both of them. I guess I should just take this as a lesson towards becoming an experienced brewer. I think the next step will be to use this pot as my mash tun. I'm going to add a weldless thermometer. Any thoughts on this? I'm glad to hear that there is really no difference between using aluminum or stainless. Even some older books, if I remember right, say not to use aluminum. Thank you all!