I have just got into casting about a month back. The first couple of batches were with lead bought off the web. Fortunately, a coworker gave me some lead ingots that he inherited and did not have a use. About 100lbs give or take. The problem is I don’t know what they were cast from. They appear to have been in a old shed for quite some time. The question is should I throw these ingots into my pot, cast a few then check hardness or melt these down and flux and make new ingots first?