Hill family on tue 8 dec 98
I am about to mix up some glaze tests at ^6. Many of the recipes include
custer spar, soda spar or potash spar. I have G-200 feldspar which I
believe is a potash feldspar and I can get kona- F4 feldspar which I
believe is a soda spar.
My Question . Can I substitute custer feldspar with a less expensive
feldspar like kona-F4 and is what is the difference in the fired qualities
of a glaze if you substitute a soda spar and a potash spar or vise versa.
Thanks in advance.
Dan
Hill Pottery
Wilno, Ontario, Canada.
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