Surface Luster
A glaze with a prismatic surface luster.
A high alkali-metal saturated-iron glaze, which where thick develops a
miror-like surface film showing
bowl is ~ 4 inches in diameter.
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 2310 deg F with a hold of 20 minutes at 2310 deg F
300 deg F an hour to 1800 deg F then a 2 hr hold at 1800 deg F
300 deg F an hour to 1750 deg F then a 1 hr hold at 1750 deg F
50 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 0.10
Al2O3 0.62
SiO2 3.0
molecular percent Silica 60.6%
varied colors. This is most prominent in
the bottom of the bowl. The absence of the luster on most of the outside of
the bowl shows the dependence of this effect on glaze thickness.
Image of the glaze satIron_ZG_0_PK_Z3K
inside
outside
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
Empirical Formula satIron_ZG_0_PK_Z3K :
Na2O 0.63
CaO 0.17
MgO 0.10
Fe2O3 0.21
P2O5 0.1