I’ll preface this with saying I’m new to casting and I’m still learning. Despite this, by following the directions I’ve been able to produce very uniform balls with the Lee two cavities and pot. I talked the manager of a local, industrial lead distributor into selling me some giant ingots for cash. He said they were 99% pure. When I melt them down the only “slag” I’m getting is a golden skin that seems to accumulate steadily on the surface as I’m casting. I don’t think it’s “slag” in the sense that it does not look at all like what I’ve seen watching YouTube’s of people casting. It’s very uniform and constant. It’s easy to skim off, but it doesn’t look like what people using wheel weights or old lead are removing. Does anyone know what this is?