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
In the empirical formula:
This glaze has alkali metals .7, alumina .79 and silica 3.3
The remaining bases are divided between calcia and Magnesia, with slightly higher
magnesia than calcia.
The is a modification of the prior glaze with crystals
Note the metallic luster of this glaze.
surface crystals are not an anomaly of that one glaze.
The pot is a conical bowl ~3 inches in diameter.
glaze satIron_ZL_3 on small bowl 3 " diameter
close up of crystal clusters
close up of one crystal cluster