Information

The recipes of the glazes posted here are the results of a research project conducted 15 years ago by my friend Bernard Brunette and I.
Les recettes des glaçures publiées ici sont les résultats d'un projet de recherche mené il y a 15 ans par mon ami Bernard Brunette et moi-même.

Hardwood ash was used, it was washed 5 times and 200 mesh-sieved.
De la cendre de bois dur fut utilisée, lavée 5 fois et tamisée à 200 mailles.
We used Ash Berhens for ease of calculating molecular analyses.
Nous avons utilisé Ash Berhens pour faciliter le calcul des analyses moléculaires

Ash Berhens :

Richard Berhens, a famous glaze chemist, proposed a mixture of
raw materials to substitute for wood ash.
Richard Berhens, un célèbre chimiste céramique, a proposé un
mélange de matériaux de base pouvant être un substitut de la
cendre de bois.
This substitution has the following analysis.
Cette substitution a l'analyse suivante :

Na2O 0.01 Al2O3 0.13 SiO2 0.47
K2O 0.04 P2O5 0.07
MgO 0.05 TiO2 0.01
CaO 0.90 Fe2O3 0.02

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Other Cone 04 glaze sites,
Autres sites de glaçures de Cone /04.

http://04glazes.blogspot.com/
http://greenglazes.blogspot.com/

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Recipes for Terra Cotta clays,
Recettes d'argiles Terra Cotta.

http://terracotta04.blogspot.com/

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C/04 Quintessence Textured Glossy Ash Glaze Base #1

Frit 3134 26.5
Frit 3110 26.5
Custer spar 3
Ball clay 26
Ash Berhens 14
Gerstley borate 4

Na2O 0.29 Al2O3 0.25 SiO2 2.14
K2O 0.04 B2O3 0.29 P2O5 0.02
MgO 0.03 TiO2 0.01
CaO 0.64 Fe2O3 0.01

Alumina:Silica ratio is 1.00:8.50
Neutral:Acid ratio is 1.00:4.07
Alk:Neut:Acid ratio is 1.00:0.54:2.19

Expansion: 87.7 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

C/04 Quintessence Ash Glaze Base #2

Frit 3134 26.5
Frit 3110 26.5
Custer feldspar 3
EPK 26
Ash Berhens 14
Gerstley borate 4

Na2O 0.29 Al2O3 0.32 SiO2 2.05
K2O 0.04 B 2O3 0.29 P2O5 0.02
MgO 0.03 TiO2 0.01
CaO 0.64 Fe2O3 0.01

Alumina:Silica ratio is 1.00:6.39
Neutral:Acid ratio is 1.00:3.42
Alk:Neut:Acid ratio is 1.00:0.61:2.08

Expansion: 87.9 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

C/04 Quintessence Ash Glaze Base #3

Frit 3134 53
Custer feldspar 3
Ball clay 26
Ash Berhens 1
Gerstley borate 4

Na2O 0.22 Al2O3 0.21 SiO2 1.73
K2O 0.02 B2O3 0.44 P2O5 0.02
MgO 0.03 TiO2 0.01
CaO 0.73 Fe2O3 0.01

Alumina:Silica ratio is 1.00:8.27
Neutral:Acid ratio is 1.00:2.73
Alk:Neut:Acid ratio is 1.00:0.65:1.77

Expansion: 84.7 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

C/04 Quintessence Ash Glaze Base #4

Frit 3134 66
EPK 19
Ash Berhens 15

Na2O 0.23 Al2O3 0.18 SiO2 1.49
K2O 0.01 B2O3 0.45 P2O5 0.02
MgO 0.02 TiO2 0.00
CaO 0.74 Fe2O3 0.01

Alumina:Silica ratio is 1.00:8.25
Neutral:Acid ratio is 1.00:2.40
Alk:Neut:Acid ratio is 1.00:0.63:1.52

Expansion: 88.3 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

C/04 Quintessence Ash Glaze Base #5

Frit 3134 31
Frit 3110 31
Ash Berhens 17
Ball clay 21

Na2O 0.30 Al2O3 0.20 SiO2 1.97
K2O 0.03 B2O3 0.26 P2O5 0.02
MgO 0.02 TiO2 0.01
CaO 0.65 Fe2O3 0.01

Alumina:Silica ratio is 1.00:9.99
Neutral:Acid ratio is 1.00:4.42
Alk:Neut:Acid ratio is 1.00:0.46:2.02

Expansion: 91.0 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

C/04 Quintessence Ash Glaze Base #6

Frit 3134 59
Custer feldspar 4
Ash Berhens 17
EPK 20

Na2O 0.22 Al2O3 0.21 SiO2 1.54
K2O 0.02 B2O3 0.41 P2O5 0.02
MgO 0.02 TiO2 0.00
CaO 0.74 Fe2O3 0.01

Alumina:Silica ratio is 1.00:7.27
Neutral:Acid ratio is 1.00:2.52
Alk:Neut:Acid ratio is 1.00:0.63:1.58

Expansion: 87.7 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

C/04 Quintessence Ash Glaze Base #7

Frit 3134 59
Custer feldspar 4
Ash Berhens 17
Ball clay 20

Na2O 0.22 Al2O3 0.17 SiO2 1.61
K2O 0.03 B2O3 0.41 P2O5 0.02
MgO 0.02 TiO2 0.01
CaO 0.74 Fe2O3 0.01

Alumina:Silica ratio is 1.00:9.55
Neutral:Acid ratio is 1.00:2.84
Alk:Neut:Acid ratio is 1.00:0.58:1.65

Expansion: 87.5 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

C/04 Semi-Gloss Ash Glaze Base #8

Ash Berhens 37
Frit 3134 41
EPK 22

Na2O 0.13 Al2O3 0.22 SiO2 1.16
K2O 0.02 B2O3 0.25 P2O5 0.04
MgO 0.03 TiO2 0.01
CaO 0.81 Fe2O3 0.01

Alumina:Silica ratio is 1.00:5.21
Neutral:Acid ratio is 1.00:2.60
Alk:Neut:Acid ratio is 1.00:0.47:1.22

Expansion: 90.2 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

C/04 Semi-Gloss Ash Glaze Base #9

Ash Berhens 38
Frit 3134 40
EPK 22

Na2O 0.13 Al2O3 0.22 SiO2 1.15
K2O 0.03 B2O3 0.24 P2O5 0.04
MgO 0.03 TiO2 0.01
CaO 0.82 Fe2O3 0.01

Alumina:Silica ratio is 1.00:5.13
Neutral:Acid ratio is 1.00:2.62
Alk:Neut:Acid ratio is 1.00:0.46:1.21

Expansion: 90.4 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

C/04 Clear Glossy Ash Glaze Base #10

Ash Berhens 43
Frit 3134 35
Ball clay 22

Na2O 0.11 Al2O3 0.19 SiO2 1.14
K2O 0.03 B2O3 0.20 P2O5 0.05
MgO 0.04 TiO2 0.01
CaO 0.82 Fe2O3 0.01

Alumina:Silica ratio is 1.00:6.11
Neutral:Acid ratio is 1.00:3.13
Alk:Neut:Acid ratio is 1.00:0.39:1.21

Expansion: 90.9 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

C/04 Quintessence Ash Glaze Base #11

Ash Berhens 46
Frit 3110 36
EPK 18

Na2O 0.17 Al2O3 0.24 SiO2 1.35
K2O 0.05 B2O3 0.02 P2O5 0.05
MgO 0.04 TiO2 0.01
CaO 0.75 Fe2O3 0.01

Alumina:Silica ratio is 1.00:5.69
Neutral:Acid ratio is 1.00:5.44
Alk:Neut:Acid ratio is 1.00:0.26:1.42

Expansion: 97.0 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

C/04 Glossy Ash Glaze Base #12

Ash Berhens 38
Frit 3110 29
Frit 3134 18
Ball clay 15

Na2O 0.19 Al2O3 0.17 SiO2 1.41
K2O 0.04 B2O3 0.13 P2O5 0.04
MgO 0.03 TiO2 0.01
CaO 0.74 Fe2O3 0.01

Alumina:Silica ratio is 1.00:8.27
Neutral:Acid ratio is 1.00:4.94
Alk:Neut:Acid ratio is 1.00:0.30:1.47

Expansion: 96.1 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

C/04 Satin/Textured Ash Glaze Base #13

Ash Berhens 46
Frit 3134 18
Frit 3110 18
EPK 18

Na2O 0.14 Al2O3 0.22 SiO2 1.17
K2O 0.04 B2O3 0.11 P2O5 0.05
MgO 0.04 TiO2 0.01
CaO 0.79 Fe2O3 0.01

Alumina:Silica ratio is 1.00:5.43
Neutral:Acid ratio is 1.00:3.76
Alk:Neut:Acid ratio is 1.00:0.33:1.24

Expansion: 95.0 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

C/04 Satin Ash Glaze Base #14

Ash Berhens 42
Frit 3134 24
Frit 3110 17
Ball clay 17

Na2O 0.15 Al2O3 0.17 SiO2 1.25
K2O 0.04 B2O3 0.15 P2O5 0.05
MgO 0.04 TiO2 0.01
CaO 0.78 Fe2O3 0.01

Alumina:Silica ratio is 1.00:7.24
Neutral:Acid ratio is 1.00:4.10
Alk:Neut:Acid ratio is 1.00:0.32:1.32

Expansion: 94.6 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

C/04 Satin Ash Glaze Base #15

Ash Berhens 43
Frit 3134 23
Frit 3110 17
Ball clay 17

Na2O 0.15 Al2O3 0.17 SiO2 1.24
K2O 0.04 B2O3 0.14 P2O5 0.05
MgO 0.04 TiO2 0.01
CaO 0.78 Fe2O3 0.01

Alumina:Silica ratio is 1.00:7.12
Neutral:Acid ratio is 1.00:4.13
Alk:Neut:Acid ratio is 1.00:0.32:1.31

Expansion: 94.7 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

C/04 Clear Glossy Ash Glaze Base #16

Ash Berhens 17
Frit 3134 60
Custer feldspar 8
Ball clay 15

Na2O 0.22 Al2O3 0.15 SiO2 1.59
K2O 0.03 B2O3 0.41 P2O5 0.02
MgO 0.02 TiO2 0.01
CaO 0.73 Fe2O3 0.01

Alumina:Silica ratio is 1.00:10.50
Neutral:Acid ratio is 1.00:2.89
Alk:Neut:Acid ratio is 1.00:0.56:1.62

Expansion: 88.9 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

C/04 Clear Glossy Ash Glaze Base #17

Ash Berhens 17
Frit 3134 30
Frit 3110 30
Custer feldspar 8
Ball clay 15

Na2O 0.29 Al2O3 0.19 SiO2 2.00
K2O 0.05 B2O3 0.25 P2O5 0.02
MgO 0.02 TiO2 0.01
CaO 0.63 Fe2O3 0.01

Alumina:Silica ratio is 1.00:10.52
Neutral:Acid ratio is 1.00:4.64
Alk:Neut:Acid ratio is 1.00:0.44:2.04

Expansion: 92.3 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

C/04 Satin Textured Ash Glaze Base #18

Ash Berhens 20
Frit 3134 50
Kona F-4 feldspar 10
Ball clay 20

Na2O 0.21 Al2O3 0.20 SiO2 1.65
K2O 0.03 B2O3 0.35 P2O5 0.03
MgO 0.02 TiO2 0.01
CaO 0.74 Fe2O3 0.01

Alumina:Silica ratio is 1.00:8.06
Neutral:Acid ratio is 1.00:3.03
Alk:Neut:Acid ratio is 1.00:0.56:1.70

Expansion: 87.2 x 10e-7 per degree C
Oxides causing abnormal expansion:

C/04 Textured Ash Glaze Base #19

Nepheline syenite 45
Dolomite 11
Ash Berhens 10
Zinc oxide 3
Frit 3134 17
Gerstley borate 14

Na2O 0.23 Al2O3 0.23 SiO2 1.26
K2O 0.05 B2O3 0.22 P2O5 0.01
MgO 0.15 TiO2 0.00
CaO 0.50 Fe2O3 0.00
ZnO 0.07

Alumina:Silica ratio is 1.00:5.56
Neutral:Acid ratio is 1.00:2.84
Alk:Neut:Acid ratio is 1.00:0.45:1.27

Expansion: 95.4 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

C/04 Beautiful Ash Glaze Base #20

Nepheline syenite 47
Dolomite 11.5
Ash Berhens 8.5
Zinc oxide 2.5
Frit 3134 18
Gerstley borate 12.5

Na2O 0.24 Al2O3 0.24 SiO2 1.33
K2O 0.05 B2O3 0.22 P2O5 0.01
MgO 0.15 TiO2 0.00
CaO 0.49 Fe2O3 0.00
ZnO 0.06

Alumina:Silica ratio is 1.00:5.59
Neutral:Acid ratio is 1.00:2.92
Alk:Neut:Acid ratio is 1.00:0.46:1.34

Expansion: 95.2 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

C/04 Textured Ash Glaze Base #21

Nepheline syenite 49
Dolomite 12
Ash Berhens 10
Zinc oxide 3
Gerstley borate 17
Frit 3134 9

Na2O 0.22 Al2O3 0.25 SiO2 1.24
K2O 0.06 B2O3 0.20 P2O5 0.01
MgO 0.17 TiO2 0.00
CaO 0.49 Fe2O3 0.00
ZnO 0.07

Alumina:Silica ratio is 1.00:5.01
Neutral:Acid ratio is 1.00:2.82
Alk:Neut:Acid ratio is 1.00:0.44:1.25

Expansion: 95.5 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3