C/6 Quintessence ash glaze

Nepheline syenite 25
Ash Berhens 25
Gerstley borate 20
Ball clay 20
Silica 10
Total 100

Na2O 0.15 Al2O3 0.35 SiO2 1.86
K2O 0.06 B2O3 0.21 P2O5 0.04
MgO 0.08 TiO2 0.01
CaO 0.71 Fe2O3 0.01

Alumina:Silica ratio is 1.00:5.25
Neutral:Acid ratio is 1.00:3.42
Alk:Neut:Acid ratio is 1.00:0.56:1.93

Expansion: 82.6 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3