These lead ingots are made from clip on automotive wheel weights.  The zinc weights are separated before melting. If a zinc weight is missed, then during melting of the wheel weights, the lead melts at 621F and zinc at 787F. Anything not melted at 625Fis removed from the pot.  The lead is fluxed once, then poured into ingots, each about 1.75-2 lbs. It will be a full 35lb of lead.