Iron as Opacifier
An initial glaze satIron_ZG_1O_1Q_1 is opaque. It has .2 molecular
equivalents of Fe2O3 in its empirical formula.
The new glaze satIron_ZG_1O_1Q_1MFe differs from the initial glaze only in its
iron content. With half the iron the new resulting glaze
150 deg F an hour to 250 deg F
400 deg F an hour to 1800 deg F
300 deg F an hour to 2050 deg F
120 deg F an hour to 2300 deg F with a hold of 20 minutes at 2300 deg F
300 deg F an hour to 1750 deg F then a half hour hold at 1750 deg F
300 deg F an hour to 1700 deg F then a Three hour hold at 1700 deg F
25 deg F an hour to 1650 deg F then a one hour hold at 1650 deg F
K2O .24
Al2O3 .47
SiO2 3.17
molecular percent Silica 65%
K2O .24
Al2O3 .47
SiO2 3.17
molecular percent Silica 66%
is a translucent
olive green.
The glaze satIron_ZG_1O_1Q_1 is opaque
The glaze satIron_ZG_1O_1Q_1MFe is translucent
inside
outside
bowl are ~3 inches in diameter
oxidation firing to cone 10 in an electric kiln
Firing profiles
Up Fire profile
Down Fire Profile
Clay body is a grolleg porcelain from Tacoma Clay Art Center.
glaze compositions
Initial glaze
Empirical Formula satIron_ZG_1O_1Q_1 :
Na2O .22
Li2O .24
CaO .16
MgO .14
Fe2O3 .2
P2O5 .04
Glaze with less Iron
Empirical Formula glaze satIron_ZG_1O_1Q_1MFe :
Na2O .22
Li2O .24
CaO .16
MgO .14
Fe2O3 .1
P2O5 .04