Went to the scrap yard a couple days ago to get some lead. I told them I wanted mostly wheel weights but I got some other stuff as well. I tried to sort the wheel weights to get rid of zinc or iron ones. Then smelted the rest. I wound up with a bunch of stuff that looked like grey oatmeal. Skimmed it off and added more lead so the clips would float. I noticed the surface of the melted lead turned bright purple. Never seen that before. What causes it? Too much heat? And what do you suppose the oatmeral is?
Jim