C/6 Quintessence ash glaze

Nepheline syenite 45
Ash Berhens 35
Gerstley borate 10
Silica 10
Total 3
Bentonite 3

Na2O 0.19 Al2O3 0.31 SiO2 1.69
K2O 0.07 B2O3 0.09 P2O5 0.05
MgO 0.06 TiO2 0.00
CaO 0.68 Fe2O3 0.01

Alumina:Silica ratio is 1.00:5.43
Neutral:Acid ratio is 1.00:4.40
Alk:Neut:Acid ratio is 1.00:0.40:1.76

Expansion: 91.7 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3