And, ya left out cheap & requires little fi any skill to apply! Uh, '' work as well as the old stuff'' er, um different, but not better. Health wise, perhaps, but not much of an issue if you takes steps to protect yourself/others. Using lead cames from your leaded glass hobby probably won't yield great results. Even plumper's lead @ 50/50 lead to tin is a bitch to control on all but level/flat surfaces. The addition of tin gives a longer ''plastic state'' of control to the molten solder. This is especially helpful when soldering vertical or reverse crown areas. Ditto on your bullet ''slugs'' as these once remelted won't contain a good alloy of lead to tin. We use to be able to get powedered flux that contained mercury, but the " Nanny State & the fucking tree huggers'' outlawed it years ago. This product worked great, but only if used over clean, well preped metal. It's great he still has the ''freedom'' to do this in Albuquerque, if he did so in a shop in SoCal he'd probably be on " America's Most Wanted '' by now Federal and State health & safety laws make the use of lead in most shops a serious libality " Humpty Dumpty was pushed ''