Thank you. Yes, the gerstley spitting off of pots is a serious issue that
many people are not aware of at all. We just lost an entire kiln load of
pieces, all of the shelves and the sitter because the Honey glaze from a
piece spit onto the sitter and kept it from shutting off (at least this is
what I was told).
"A&V" wrote in message
...
Hi dkat,
I have started playing with cone six glazes by adjusting my favourite cone
10 glazes... however, I was always firing oxidation, so it was a bit
easier.
Anyway, If you add 10% frit 4108 ( used to substitute gerstley borate) to
cone 10 glazes, you are likely to get simmilar glaze maturing at cone
6....as a rule of thumb... or replace potash feldspar with soda feldspar.
I tend to avoid gerstley as it is water soluable and tends to spitt off
pots
during firing.
Andrea
"dkat" wrote in message
. ..
Just curious how people are doing on coming up with glazes without
Gertsley
Borate. Does anyone have a favorite out of the "Mastering Cone 6
Glazes"
book? All of the glazes we use in the studio I have worked in are based
on
the various Gertsley formulas. The glazes I like are the Randy's Red,
Honey, and the copper glazes that can't be used on the inside of pots
(Pennels with Erins green)...

I have just bought an electric kiln and have "Mastering Cone 6 Glazes" .
I
was schooled in reduction ^8-10 and am more than a tad nervous about the
whole endeavor of oxidation firings at cone 6. To me even the Gertsley
Borate glazes often look flat with oxidation ^6. My favorite glazes
that
I
learned on were Albany slip with rutile oxide decorations, the iron
based
celadon when it went blue sea green, and Shino. I do not want to carry
on
the error of using GB. I'm working in a very small space and don't
really
want to buy more that a half dozen bags of ingredients. In any case I
can't
seem to kick start myself into beginning. I find that even though I
used
to
make up our glazes for reduction firings that I don't know what silica
to
use for the base glazes out of MC6G... We never used silica as the
ingredient "Silica" and my catalogs don't have anything listed in that
form
that appears to be a glaze ingredient. Now I have given much more
information that anyone cares to read or is interested in..... Mostly
I'm
looking for some kind of nudge to get me in gear.