Hello all,
I recently cast some brass medallions, the finished items had
surface pitting, the process was lost wax casting, I did the burnout
with a batch of rings which were cast in Sterling Silver, all the
sterling silver items cast perfectly.
When I melted the brass a thick yellow smoke issued from the melt, I
think maybe the zinc burned out causing the problem. The brass used
was new brass rod, no rubbish in the melt, any advice re flux etc
would be appreciated.
Thanks Ivan.