An Iron Impurity Orange Glaze
This glaze, sIron_MFe_Z3A_1, containing no added iron and fired on a porcelain
body becomes a pale, opaque orange.
The amount of iron required to produce a color of a particular saturation is
determined by the composition of the glaze.
At the other end of the scale, how little iron does it take to color a glaze?
Celadon glazes with .01 molecular
This is the strongest color I've seen in an opaque glaze, on a non
iron-bearing clay body, with 0.007
150 deg F an hour to 250 deg F
400 deg F an hour to 2050 deg F then a hold of 20 min
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 2210 deg F then a one hour hold at 2210 deg F
80 deg F an hour to 1900 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 Two hour hold at 1700 deg F
300 deg F an hour to 1600 deg F then a Two hour hold at 1600 deg F
K2O 0.06
Al2O3 0.49
SiO2 2.73
molecular percent Silica 62.5%
I've seen saturated iron glazes
with between .1 molecular equivalents, and .3 molecular equivalents.
equivalents of iron are common.
molecular equivalents of iron.
Image of the glaze sIron_MFe_Z3A_1
inside
outside
bowl is ~ 3.5 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 composition
Empirical Formula sIron_MFe_Z3A_1 :
Na2O 0.02
Li2O 0.15
CaO 0.44
MgO 0.11
SrO 0.22
Fe2O3 0.007
P2O5 0.12
TiO2 0.01