I went to a restaurant supply store and got myself a brand new stainless steel frying pan. Three hours later I am now the proud owner of a brand new stainless steel frying pan with a large brown stain on the interior, courtesy of heating my oil too long to the point where it was smoking (at least I think that's what caused it). Should I be worried about it? Would the discoloration affect the performance of the pan? I'm not really concerned about appearance. FYI, it's a cheap $12 pan, doesn't even have a brand, it just says "made in China." Thanks.