I used GlazeMaster software and came up with some formulae to test based on:

I used GlazeMaster software and came up with some formulae to test based on:

From: Ulrike Franck [mailto:ulrike.franck@email.de]
Sent: Friday, May 18, 2012 9:59 AM

Ulrike wrote "my idea is this one: To find out the best amount of CaO (mol, in the seger formula) for crystallisation. I have a glaze similar to Rita´s with 0.52 mol CaO. And I have tested it - with less CaO but more PbO you do not get good results. But how about more?

And how about the alumina content?

What I would like to test is this:

2.)

0.005 MgO . 0.10 Al2O3 . 2.913 SiO2

0.888 CaO 0.141 B2O3

0.023 PbO

0.077 Na2O

Recipe Name: Gordon's 3134 - .1 alumina

Cone: Color:

Firing: Surface:

Amount Ingredient

14.9 Frit--Ferro 3134

2.1 Lead Monosilicate

25.5 Whiting

44.7 Silica

12.8 Ball Clay--Old Mine #4

100 Total

Unity Oxide

.074 Na2O

.004 K2O

.008 MgO

.887 CaO

.027 PbO

1.000 Total

.104 Al2O3

.144 B2O3

.004 Fe2O3

2.843 SiO2

.006 TiO2

27.4 Ratio

6.7 Exp

Comments:

-----------------------------------

Calculations by GlazeMaster™

www.masteringglazes.com

------------------------------------

3.)

0.027 PbO . 0.179 Al2O3 . 2.913 SiO2

0.95 CaO 0.141 B2O3

0.077 Na2O

Recipe Name: Gordon's 3134 - .95 CaO

Cone: Color:

Firing: Surface:

Amount Ingredient

.3 Frit--Ferro 3134

2.2 Lead Monosilicate

33.9 Whiting

25.1 Silica

24.8 Ball Clay--Old Mine #4

13.7 Gerstley Borate--1999

100 Total

Unity Oxide

.02 Na2O

.006 K2O

.011 MgO

.938 CaO

.024 PbO

1.000 Total

.191 Al2O3

.127 B2O3

.005 Fe2O3

1.713 SiO2

.009 TiO2

9 Ratio

7.4 Exp

Comments:

-----------------------------------

Calculations by GlazeMaster™

www.masteringglazes.com

------------------------------------

4.)

0.027 PbO . 0.10 Al2O3 . 2.913 SiO2

0.95 CaO 0.141 B2O3

0.077 Na2O

Recipe Name: Gordon's 3134 - .95 CaO - .1 Alumina

Cone: Color:

Firing: Surface:

Amount Ingredient

15 Frit--Ferro 3134

2 Lead Monosilicate

25 Whiting

45.1 Silica

13 Ball Clay--Old Mine #4

100.1 Total

Unity Oxide

.075 Na2O

.004 K2O

.008 MgO

.886 CaO

.026 PbO

1.000 Total

.107 Al2O3

.147 B2O3

.004 Fe2O3

2.91 SiO2

.006 TiO2

27.3 Ratio

6.6 Exp

Comments:

-----------------------------------

Calculations by GlazeMaster™

www.masteringglazes.com

------------------------------------

5.)

0.005 MgO . 0.179 Al2O3 . 2.913 SiO2

0.52 CaO 0.141 B2O3

0.023 PbO

0.10 Na2O

0.10 K2O

0.252 ZnO

Recipe Name: Gordon's 3134 - .52 CaO -.252 ZnO

Cone: Color:

Firing: Surface:

Amount Ingredient

14.3 Frit--Ferro 3134

2 Lead Monosilicate

15.1 Whiting

40.7 Silica

20.4 Kaolin--EPK

7.5 Zinc Oxide

100 Total

Unity Oxide

.073 Na2O

.003 K2O

.005 MgO

.611 CaO

.281 ZnO

.027 PbO

1.000 Total

.23 Al2O3

.145 B2O3

.003 Fe2O3

2.883 SiO2

.002 TiO2

.001 P2O5

12.5 Ratio

6.4 Exp

Comments:

-----------------------------------

Calculations by GlazeMaster™

www.masteringglazes.com

------------------------------------

6.)

0.005 MgO . 0.10 Al2O3 . 2.913 SiO2

0.52 CaO 0.141 B2O3

0.023 PbO

0.10 Na2O

0.10 K2O

0.252 ZnO

Recipe Name: Gordon's 3134 - .52 CaO, .252 ZnO, .1 Al2O3

Cone: Color:

Firing: Surface:

Amount Ingredient

20.4 Frit--Ferro 3134

2.8 Lead Monosilicate

14 Whiting

46.1 Silica

9.8 Kaolin--EPK

7 Zinc Oxide

100.1 Total

Unity Oxide

.098 Na2O

.001 K2O

.003 MgO

.611 CaO

.249 ZnO

.036 PbO

1.000 Total

.106 Al2O3

.196 B2O3

.002 Fe2O3

2.898 SiO2

.001 TiO2

0 P2O5

27.3 Ratio

6.5 Exp

Comments:

-----------------------------------

Calculations by GlazeMaster™

www.masteringglazes.com

------------------------------------

I also came up with this one which hopefully duplicate Gordon's 3134 while using Gerstley Borate.

Recipe Name: Gordon's Gerstley

Cone: Color:

Firing: Surface:

Amount Ingredient

12.3 Gerstley Borate--1999

1.9 Feldspar--Custer

1.7 Soda Ash

.4 Dolomite

23.6 Whiting

14 Kaolin--EPK

.3 Rutile

44 Silica

1.9 Lead Monosilicate

100.1 Total

Unity Oxide

.073 Na2O

.008 K2O

.013 MgO

.879 CaO

.027 PbO

1.000 Total

.203 Al2O3

.145 B2O3

.003 Fe2O3

2.883 SiO2

.013 TiO2

0 P2O5

14.2 Ratio

6.6 Exp

Comments:

-----------------------------------

Calculations by GlazeMaster™

www.masteringglazes.com

------------------------------------

And this one using no lead.

Recipe Name: Gordon's 3134 no lead

Cone: Color:

Firing: Surface:

Amount Ingredient

14.2 Frit--Ferro 3134

24.4 Whiting

37 Silica

24.4 Ball Clay--Old Mine #4

100 Total

Unity Oxide

.077 Na2O

.008 K2O

.012 MgO

.903 CaO

1.000 Total

.208 Al2O3

.146 B2O3

.006 Fe2O3

2.938 SiO2

.011 TiO2

14.1 Ratio

6.6 Exp

Comments:

-----------------------------------

Calculations by GlazeMaster™

www.masteringglazes.com

------------------------------------