High Alumina Iron Orange
Here is a high alumina iron orange glaze.
cone 10 oxidation
Firing profile
Up Fire profile
150 deg F an hour to 250 deg F
400 deg F an hour to 2050 deg F
120 deg F an hour to 2250 deg F
60 deg F an hour to 2310 deg F with a hold of 20 minutes at 2310 deg F
Down Fire Profile
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 one hour hold at 1650 deg F
The cones show this as a cone 10 firing.
K2O .35
Al2O3 1.2
SiO2 3.63
molecular percent Silica 62 %
This glaze has properties which I have previously
encountered in high alumina glazes.
It is almost a full gloss glaze, with Silica:Alumina ratio of less than 3.
The quantity of iron which gives this glaze a strong color with an orange
tint, is small.
Clay body is a grolleg porcelain from Tacoma Clay Art Center.
glaze compositions
Empirical Formula glaze sh_Z1C_0 :
Na2O .32
Li2O .29
CaO .03
MgO .01
Fe2O3 0.01
bowl is ~ 4 inches in diameter
glaze sh_Z1C_0
Remarks