I'm planning on making some red brass.
I have about 1.8 kilo of Cu. I have weighed out about 110 g of Pb (from an xray tube) Sn from eBay, and Zn from the usual source. That ugly chunk top left is mystery brass that I am assuming is about 70/30 Cu/Zn. I will add about a kilo of that for volume and that will dilute my concentrations a little. That will be OK as long as there is no Si in it which I doubt. Some of the Zn will burn out during melting too. There is some solder on the pipe which is probably Sn-Sb? I will be happy if I end up around 85,8,4,4. If I can get all the copper into solution this will look really red. The lead will be at least 3% which will help with machinability.
Any thoughts from you metallurgists out there?
It will probably cost me $21 of propane to make $20 of brass....
On second thought: If my mystery brass really is 30% Zn, I should add NO zinc. Combined with the 2 kilos of other metals that would still yield 10%(minus losses as fumes)