Lili Krakowski on wed 24 sep 08
Ron writes: " It would be wonderful to have a well melted cone
6 glaze without having to use a frit, boron or Zinc. I wonder if
you have
hit on some sort of ideal melting ratio - eutectic mixture - that
would be
a step forward for all those who fire at cone 6.
"Ron: Here are three:
Recipe Name: deboos clear test
Amount Ingredient
50 Nepheline Syenite
40 Whiting
50 Ball Clay--Old Mine #4
20 Flint
160 Total
Unity Oxide
.153 Na2O
.056 K2O
.016 MgO
.775 CaO
1.000 Total
.472 Al2O3
.007 Fe2O3
2.402 SiO2
.014 TiO2
5.1 Ratio
79.9 Exp
I have no idea where I got the following--but obviously it was
created by one Mr Baldwin.
Recipe Name: gordon baldwin dolomite c 7
Amount Ingredient
41.5 Feldspar--Custer
7 Dolomite
23 Whiting
19.5 Ball Clay--Old Mine #4
9 Flint
20 Zircopax
120 Total
Unity Oxide
.056 Na2O
.122 K2O
.103 MgO
.719 CaO
1.000 Total
.324 Al2O3
.005 Fe2O3
2.395 SiO2
.008 TiO2
7.4 Ratio
68.1 Exp
This one seems to have come from Tony Martens--
Recipe Name: martens ToDo white
Amount Ingredient
90.9 Nepheline Syenite
9.1 Whiting
100 Total
Unity Oxide
.493 Na2O
.152 K2O
.01 MgO
.345 CaO
1.000 Total
.712 Al2O3
.002 Fe2O3
3.151 SiO2
4.4 Ratio
93.8 Exp
It probably crazes--but adding silica should solve that.
Recipe Name: CM whitebase
Amount Ingredient
35.3 Wollastonite
35.3 Feldspar--Kona F4
29.4 Ball Clay--Old Mine #4
100 Total
Unity Oxide
.118 Na2O
.059 K2O
.045 MgO
.778 CaO
1.000 Total
.434 Al2O3
.008 Fe2O3
2.714 SiO2
.012 TiO2
6.3 Ratio
74.6 Exp
Comments: opacify-- 3.5 tin
ALL calculations by GlazeMaster(tm)
I know I have tested and used the DeBoos. As to the others--duh.
I probably did test them, but some time ago, and I am too lazy to
go through my endless notebooks. But zinc/boron/frit free c.6
glazes do walk this earth.
Lili Krakowski
Be of good courage
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