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