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> Does anyone have some tips on how to make gold ingots that
> don't have air bubbles in them and start to crack when you mill
> them out?
I am working with 20 students a day (for 15 years) and they are
all making ingots almost each day and I still doing my own ingots
at home. I can tell that I have seen almost every krazy things
about ingots. Personally I do not beleive in heating or tilting the
ingots molds before, but cleaning it with an oily cloth (3 in 1
oil or motor oil) and add a little bit more oil on the lips of the
ingot mold is good. Air bubbles and cracks reveals to me that you
heat to much your metal. Heat the metal, put a pinch of borax, tilt
the crucible until the metal is going to drop in the mold, keep it
there, heat it and by the time you can see the metal rolling on
imself in the crucible, heat it for about 10 seconds more and drop
it as fast as you can in the mold, continuously without jerks. The
problem can also come with old or bad metals. The heat is coming
to fast when you are using an oxiding flame. Vincent Guy Audette
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