I have made 7 consecutive attempts to alloy an ingot of 18k yellow. Using 24k shot 1 troy oz, 3.88 pure silver shot, 3.88 copper cut from a .999 pure copper round that I had purchased from silver.com precious metal seller. The shot gold was from apmex.com, the silver from rio grande. I also included in the melt 18k yellow shot (half oz) from rio grande. So about 54 grams total in a crucible rhat was glazed w borax.
I cannot get the copper to mix into the melt, but rather seems to rise to the top when i have poured it into a hrated steel mould, and quench, pickle it. You can see the copper layer on the top. That layer is black before its pickled. On the first few attempts a green residue remained in the crucible. Mired in the borax, i presume. I have cleaned it oit by tilting and heating the borax so contaminates poired out.
I am gyrating the crucible. And the melt is fluid, pink orange, and the surface is showing movement at high temperatures which leads me to conclue it is mixed welll. I am keeping the rosebud little torch on the metal as I am pouring it into the mould. This is my first time trying this torch, the crucible, or melting and alloying. I am sprinkling a pinch of borax during the melt. I am using an oxy-acetylene set up. Any ideas what I might be doing to cause the copper to remain separated from the gold-silver?