C/6 Quintessence ash glaze

Nepheline syenite 44.5
Ash Berhens 33.5
Gerstley borate 11
Silica 11
Total 100
Bentonite 3

Na2O 0.19 Al2O3 0.31 SiO2 1.74
K2O 0.07 B2O3 0.10 P2O5 0.04
MgO 0.06 TiO2 0.00
CaO 0.68 Fe2O3 0.01

Alumina:Silica ratio is 1.00:5.57
Neutral:Acid ratio is 1.00:4.40
Alk:Neut:Acid ratio is 1.00:0.41:1.80

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