Three Glazes

The glaze half way between iron_8_11 and iron_8_Right, named iron_8_13 for its position in the line blend from which all these glazes are derived shivers as shown in the last picture.

The two end glazes, iron_8_11 and iron_8_Right have now been fired several times, show no glaze fit problems. Wherefore is this glaze "in the middle" different? I will be gratefull if any of you have suggestions.

full view

glaze iron_8_11 plate ~8.5 inch diameter



full view

glaze iron_8_Right plate ~ 8.5 inch diameter



full view

glaze iron_8_11 + iron_8_Right bowl ~ 5 inch diameter



full view

glaze iron_8_11 + iron_8_Right showing shivering on outside of bowl

The glaze iron_8_Right + iron_8_Right is iron_8_13, the midpoints between the two glazes.

The recipes and empirical formulas of the three glazes

iron_8_11 Recipe
Ball_Clay                 28                       
Bentonite                 6                        
Bone_Ash                  8                        
Frit_413                  42                       
G_200_HP_Feldspar         44                       
Lithium_Carbonate         12                       
Magnesium_Carbonate       8                        
Nepheline_Syenite         30                       
Red_Iron_Oxide            18                       
Silica                    4                        

iron_8_11 Empirical Formula
K2O 0.1289          Al2O3 0.4200         SiO2 2.7689         
Na2O 0.2866         B2O3 0.0000          P2O5 0.0387         
Li2O 0.2634         Fe2O3 0.1889         ZrO2 0.0000         
CaO 0.1483                               TiO2 0.0068         
MgO 0.1728                               SnO2 0.0000         
SrO 0.0000                                                   
ZnO 0.0000                                                   
BaO 0.0000                                                   



iron_8_Right Recipe
Bentonite                 6                        
Bone_Ash                  8                        
Dolomite                  4                        
Frit_413                  42                       
G_200_HP_Feldspar         52                       
Lithium_Carbonate         11                       
Nepheline_Syenite         58                       
Red_Iron_Oxide            19                       

iron_8_Right Empirical Formula
K2O 0.1637           Al2O3 0.4208         SiO2 2.8319         
Na2O 0.3578          B2O3 0.0000          P2O5 0.0386         
Li2O 0.2403          Fe2O3 0.1954         ZrO2 0.0000         
CaO 0.1876                                TiO2 0.0000         
MgO 0.0506                                SnO2 0.0000         
SrO 0.0000                                                    
ZnO 0.0000                                                    
BaO 0.0000                                                    



iron_8_13_recipe
Bentonite                 6                        
Bone_Ash                  8                        
Dolomite                  4                        
Frit_413                  42                       
G_200_HP_Feldspar         52                       
Lithium_Carbonate         11                       
Nepheline_Syenite         58                       
Red_Iron_Oxide            19                       

iron_8_13 Empirical Formula
K2O 0.1463           Al2O3 0.4204         SiO2 2.8004         
Na2O 0.3223          B2O3 0.0000          P2O5 0.0386         
Li2O 0.2518          Fe2O3 0.1922         ZrO2 0.0000         
CaO 0.1680                                TiO2 0.0034         
MgO 0.1116                                SnO2 0.0000         
SrO 0.0000                                                    
ZnO 0.0000                                                    
BaO 0.0000                                                    



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