David Hendley on tue 26 jan 99
Here are 2 unity formulas for Oxford feldspar:
This one is 25 years old, from my glaze calculation class:
..58 K2O
..42 Na2O
1.16 Al2O3
7.66 SiO2
weight=660
From an early edition of Insight glaze calculation program:
..05 CaO
..59 K2O
..36 Na2O
1.17 Al2O3
8.07 SiO2
weight=686
I don't know if Oxford is still available. I haven't heard anything
about it in years.
Here is your glaze, recalculated using Custer feldspar.
Colemanite and Gerstley Borate are not interchangable,
here it is both ways
Original:
> Eyes of Green Cone 9
>
> Weight. Pct.
> Colemanite (Gerstley Borate) 11.73
> Oxford (Barter Feldy Can Sub.) 39.96
> Dolomite 6.96
> Talc 14.61
> Kaolin 4.97
> Flint 19.48
> Chromium oxide 1.14
> Cobalt carbonate 1.14
> 99.99%
>
Eyes of Green, original with colemanite, recalculated:
20 Custer feldspar
11 Gerstley Borate
13 Ferro Frit 3134
3 dolomite
16 talc
14 EPK kaolin
23 flint
(+colorants)
Eyes of Green, original with Gerstley Borate, recalculated:
36 Custer feldspar
12.5 Gerstley Borate
7 dolomite
14.5 talc
7.5 EPK kaolin
22.5 flint
(+ colorants)
David Hendley
Maydelle, Texas
hendley@tyler.net
http://www.farmpots.com
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