Wow that's some good info! I like the idea of mixing a little copper into extruded aluminum or making aluminum bronze. Aluminum and copper are the two metals I have plenty of, so if there is a beneficial combination of those two, then I'm interested to try it. The zinc-aluminum alloy probably not though. I don't have a ton of zinc, I didn't know it needed that much. I also didn't know aluminum bronze was that strong, sounds like a good material for stuff. I'm not too concerned about machinability, I don't have a lathe or anything like that anyway. Gold color sounds pretty cool, also. Does it form a cool patina like bronze or copper does?
I'll give some of your fluxing suggestions a try. I checked and I don't have any glass bottles like I thought, but tomorrow is thanksgiving so there will be plenty to grab.
I do have 2 crucibles, the video has a lot of cuts so it's hard to tell.
I'll avoid the brass then, I don't have much of it anyway. I do have a respirator, but no filters for zinc gasses or anything like that. It's mainly for dust and powders from wood working, though I do have some filters designed for welding. I think specifically they are for ozone created by the arc when mig welding, not gasses from welding galvanized steel, so they probably wouldn't work for zinc fumes from brass.