This may be a really dumb question, but last summer, I bought an inexpensive, light silver (aluminum?) pan with lots of dime-sized holes to cook veggies, shrimp, etc. over a gas grill. After several uses, the silver has gone completely black with a thin, scorched "crust" of oil or something - and it's fused on there for good.
I know blackened meat is a carcinogen -- so does that mean the pan may be carcinogenic too? Or is it just getting seasoned? I wouldn't think twice if it was cast iron, but I don't know about other metals.