I had a small problem with the pores at the bottom of the blanks when casting. They are small but visible. I use Siraya resin dry in glycerine for 20 minutes each side of the printed wax. But at the end, when pouring, there are pores in the lower part. Could it be with brass quality?
Regarding brass, I use granulated brass for castings. When melting at 980 degrees, cobwebs and strange precipitation form from above. Should they be cleaned?