While dumpster diving, I often come across pots and pans. The problem is, unless it's an aluminum pot, I don't know of a good way of figuring out what they are made of and, more importantly, what they are worth as scrap. OK, if a magnet sticks to it, I guess I just throw it into the iron/steel pile. But what if it does not and it's not aluminum? Are there any "quick and dirty" rules of classifying pots and pans scrap? Thanks!