Crystals in Iron Glaze
cone 10 oxidation
Firing profile
A two hour hold at 1850 deg F
A half hour hold at 1750 deg F
A three hour hold at 1700 deg F
slow downfire at 25 deg F an hour in the interval 1700 deg F to 1650 deg F
A half hour hold at 1650 deg F
Clay body is a grolleg porcelain from Tacoma Clay Art Center.
glaze composition
Emperical Formula satIron_ZG_Ip7_5
K2O 0.07
Na2O 0.43
Li2O 0.2
CaO 0.13
MgO 0.17
Al2O3 .71
Fe2O3 .1
SiO2 3.12
P2O5 .037
The visible individual crystals, ~ 3/8 inch diameter were a surprise as this glaze contains neither Zinc nor Titanium.
The pots is a conical bowls ~3 inches in diameter.
close up of crystals
glaze satIron_ZG_Ip7_5