June Perry on tue 7 may 02
Ron, I ran frit 3124 through Tony Hansen's program.Insight and matched it
(very closely) empirically with the formula I posted. I just re-checked it
and on the Tony Hansen software, the recipes side to side, are empirically
very, very close.
Now either one of us is not understanding something or the program is doing
something screwy.
The formula I posted was not a substitute for her glaze recipe. It is only a
recipe to make up a batch of material to mix as substitute for Frit3124.
When I rechecked them side by side, both 100 of my frit 3123 sub and 100 of
frit 3124 show.55 moles of B2O3, .7 Cao, etc.
Tony's Gerstley borate formula does not show any mgo, which is why none is
in
my substitute.
Gerstley Borate is more often shown as this which I just found, using a web
search
2Cao . 3B2O3 . 5H2O
This is the same formula that Rhodes gives in Clay and glazes. Parmalee, as
far as I could find in a quick search, only addresses Colemanite (same
formula as shown above for the gerstley).
I see that Tony on his web site of gerstley subs, lists gerstley borate
rationalized, which does include Mgo, but it is not in the formula in his
software, nor in the source for the one I listed above. I don't know what it
means by rationalized. I know that gerstley has been somewhat inconsistent
in
it's formula over the years, so I'm assuming that at one time it had, or now
has MgO in it????
I'll have to check with a current source to see what formula they're using
since I have two new bags of it.
I'm certainly up to admitting a mistake if one was made and I'm certainly up
for improving my limited knowledge of glaze chemistry.
Warm regards,
June
PS: I sent this earlier, but sent it from my old email address and I'm
thinking that it could be the reason it hasn't come through. If it's a
duplicate, please erase the other one, since I corrected a few spelling and
format errors on this one.
Thanks!
June
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