Hi I hate using foil and just discovered enamel baking trays. It's better non-stick than teflon and looks pretty hard wearing. But since pretty much everything today releases some sort of deadly toxin, I wondered if there was any reason I shouldn't be using it? I have better things to do with my life than scour steel cooking equipment but I try to avoid things that are outright poisonous. According to Wikipedia though, it's just melted glass powder. Thanks Ashley