C/6 Quintessence ash glaze

Nepheline syenite 27
Ash Berhens 27
Gerstley borate 18.5
Ball clay 9
Silica 18.5
Total 2
Bentonite 2

Na2O 0.15 Al2O3 0.30 SiO2 2.00
K2O 0.06 B2O3 0.19 P2O5 0.04
MgO 0.07 TiO2 0.01
CaO 0.71 Fe2O3 0.01

Alumina:Silica ratio is 1.00:6.76
Neutral:Acid ratio is 1.00:4.28
Alk:Neut:Acid ratio is 1.00:0.48:2.06

Expansion: 81.9 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3