I have been pondering making ductile iron for a while, and Jammer gave me some additive to try (ferro-mag I think). As I read about magnesium being part of the additive, I of course think of the safety aspects of molten iron mixing with anything that has magnesium in it. So my plan is to figure out ductile iron next spring, so I can make crankshafts for engines. Luckily it would seem that others are paving the way for me, ie: the local Metal Museum folks and the artists that come from all over when they do their iron pours. Here is a video that castirongypsy posted today of them making ductile iron at one of their iron events. I don't remember this at this year's FIRE, so perhaps I missed it, or it could have been at another event, and I was not aware that they were casting ductile iron. I think adding ferro-mag will require taking safety to a much higher level, but it would be very exciting to be able to master this material and method. I think the greatest danger would be having a reaction that ejected iron and ferro-mag out of the crucible and onto your pants, jacket, headgear, feet, etc., because it may stick and then burn its way through just about anything. Edit: I think a metal shield (like 48"x48") may be a good idea to stand behind until the reaction is complete. Luckily they did not panic in the video, which could have turned a difficult situation into a dangerous one.