I have a set of frying pans that came from my girlfriend's grandmother's house in Brittany. I think they're made of steel but I can't really tell because there's some sort of black shiny coating on them that resembles enamel. Is there such thing as enameled steel? If so is there anything special to do to take care of them? It's possible that they could be quite old (>100 years), could there be any health risks associated with using them?