Over the years I've had plenty of ocaisions to use old gold. It
only scares me when I don't know what quality metal I am working
with. In particular, I try to keep out white gold dental golds.
Otherwise, if cracking starts, I will bring the metal to a nearly
white heat and cook out most of the zinc. I don't know what else
might bev burning out, but if I add zinc to the resulting mass
the color and quality seem to improve. If the metal is for
resale, it probably is a real good idea to just refine it when a
few ounces have accumulated and alloy new metal as needed. In my
book, pitting is not a result of poorly alloyed or impure metal
so much as too hot a flask or improper spruing. Furthermore,
virtually all pitting can be removed with a rotary burnisher.
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