Here is my second question…
I have recently had some pieces cast for me for the first time. They
are coming to me unfinished and I am soldering findings onto them.
They have grey blotches (I apologize for sounding stupid, I think
it’s it’s firescale but I’ve never run into it before). Any
recommendations for how I can remove the grey, possibily involving
my vibratory tumbler?
Many, many thanks!