

Chemistry instructor here. It depends on how hot you get the pan. For the most part, the lead is going to stay in the seasoning, like someone mentioned above. However, if it got anywhere close to the melting point of the iron, you could wind up incorporating some of the lead into the iron itself. This seems pretty unlikely, as lead melts at about 325oC and iron melts above 1,500oC, but it’s possible as natural gas and propane burners can get up to above 1,900oC
Me too, but since we don’t know exactly why they were melting lead or what other metals might have been mixed it, it’s impossible to say for sure.