Colemanite Glaze #12 Gloss/Opaque/White

Custer feldspar 36
Silica 20
Colemanite 20
Zinc oxide (Calc.) 10
Barium carbonate 7
Talc 7
Total 100

Bentonite 100

Na2O 0.05 Al2O3 0.17 SiO2 2.19
K2O 0.10 B2O3 0.38 TiO2 0.00
MgO 0.14 Fe2O3 0.00
CaO 0.29
MnO 0.00
ZnO 0.32
BaO 0.09

Alumina:Silica ratio is 1.00:12.77
Neutral:Acid ratio is 1.00:3.95
Alk:Neut:Acid ratio is 1.00:0.55:2.19

Expansion: 71.0 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3