Hi there, thanks in advance for any help!
So I keep getting fire scale / stain in my sterling silver castings which I don’t see untill the pieces are polished.
I cast with my flask at 560 centigrade, my metal at 970 centigrade. Using an open vacuum casting “Kaya cast” unit and an electro melt. I quench the flask after 5 or so mins once the button is no longer glowing red in a dark room.
Any advise on preventing firescale?! What am i doing wrong? See attached photos!
Thanks so much for any help!