I just received a new .715 brass mold from Tanner, and decided to try it out.
I cooked some pure lead, heated the mold and went at it. I managed to cast a half-dozen balls that were useable and then a rolling fustercluck started. A small bit of allow got into the mold and solidified in the bottom of the seal between the two halves. Soon, I had wing forming on the bullets from lack of a good seal, and nothing I did could get it to stop-- just make it worse. Pretty soon, I couldn't keep a seal on the mold and I was leaking.
I figured somebody here would know what to do, so I poured out the rest of the alloy into ingots and came in.
What do I do to get the alloy cleaned off the mold?