Silver casting

Lorne, a couple of suggestions for silver casting. I never use
sheet stock as it is alloyed for rolling not casting. i have also
started using united precious metals master silver alloy. great
results with no oxidation in the castings and finally i never
cast without using a product called Vacu-liner.it is designed for
vacume casting but works great for centrifuge as well it helps to
releive excess gas pressure . the three things have brought my
silver casting to the quality i have been searching for for some
time. hope this helps, Frank, Houston,tx