Most frightening flux ever
By the way +1 on sawdust, wax and marvelux (I use wax or sawdust personally)
But while I was doing some casting a while ago, my room mate had left a thing of margarine on the counter, it looked pretty gross, so I figured he wasn't going to eat any more (it had been there for a week with the lid off). So I added a little bit of it to my cast, well first came the smoke, then the fire (just like with wax), then came the most horrible smell I can imagine. The smell just continued, it smelled like being locked in a CONEX container with a flaming trashcan of fish. The most frightening thing about it, the margarine did not burn off. It just sat there, floating on top of the lead, still liquid showing no signs of leaving.
If margarine doesn't flash off like wax, butter, sawdust, wood, motor oil etc at the temperature of melting lead, what does it take to get it to break down in your body. I've never eaten margarine since then.