To make a long story short, a customer wants a very special knife, which is mostly built. But he wants embellishments on the knife that I've never attempted before, so I'm seeking advice from the good and knowledgeable people in this group.
He wants a solid gold thumb stud, and he sent me the gold. It is, for the unsqueamish, a dental bridge and a couple of gold crowns, apparently harvested from his own mouth a few years ago when he plowed into a bridge abutment and ate the steering wheel. The doctors had to reconstruct his face, but they saved his gold teeth, which he sent to me for this project.
Yeah. He sent me his teeth. You can stop gaping now. Metal content ensues:
I've looked online and found that dental gold can contain lots of other metals, including platinum, palladium, silver and even chromium, copper and zinc. No way to tell what's in this guy's teeth. The fittings don't look like gold. They look like untarnished copper. They don't have the look of a 24 karat grille, but they are 40 years old.
I've melted and cast small gold parts before, but only from gold that was 100% identifiable in terms of alloy. This is a different situation. I have no way to know what's in this amalgam. I'm afraid to put a torch to it.
My tooling includes a heat-treating oven that can reach 2200° F, a propane torch and an AO rig. I have crucibles for precious metal melting.
How can I make this guy's thumb stud?
-Frank