Of late, I've been casting ingots and bars and have a question
concerning that; Do I cast into a hot, warm or cold ingot mold,
and what are the reasons for doing it?
Hot. One of the major constituents of the resulting gases from a
torch is water. This water will quickly condense onto cold metal. In
the case of a metal mold, when hot metal hits this condensation, it
vaporizes immediately resulting in sputtering metal. I have worked
with jewelers that have refused to believe this, and I have watched
them spending many hours in the “jewelers position” picking little
metal bits off of the floor. It could have been a lot worse.
I like to lubricate my molds with olive oil. When burned into the
mold, it provides a layer of carbon that keeps to two metals apart
and seems to allow more even cooling.
JA Certified Master Bench Jeweler