Hi everybody! I am new to this community and I have a question to which I could not find an answer online even though I found similar threads. About 4 years ago I bought a Cuisinart stainless steel Multiclad cookware and I have been happy with it. It is a triply, with stainless steel on top and at the bottom, and an aluminum core in between. I always hand wash my pots and pans and always use a soft sponge to do it.
About a year ago on two of my pans I noted a circular shape that is starting to appear inside the bottom of them, as shown in the picture. The edges of this circular shape are visible only in some parts of the bottom, but you can clearly see that the outline is going to form a perfect circle. It doesn't feel different in consistency or "texture" when I touch it, and it is not a spot that can be clean. My guess is that with usage and cleaning an external kind on polishing or coating is slowly coming off revealing this circular shape underneath. My question is: is it possible I am actually starting to expose the aluminum disc at the core of the pan? It would seem unlikely to me, given the set is fairly good and it is just 4 years old, it is not chipped or dented, but I have no idea what else could it be.
Thanks for your help!