Mickey, I am sorely lacking in knowledge of metallurgy. Like karate, I know just about enough to get my azz kicked. I just try not to get the stuff hot enough to melt the zinc. That way I have one less thing that I don't understand to worry about. Plus I sort ahead of time. The zinc weights are easy to spot. Actually these days the lead weights are the easiest to spot because there are so few of them.
Alan
