Interactions between adjoining glazes
The interface between two glazes applied side by side.
Several closeups of the interaction region of the two glazes are shown and,
for context, a picture of the pot.
The design is created by adhering a mask and then applying the main
glaze. After drying, the entire pot is coated in wax,
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 .11
Al2O3 .56
SiO2 3.12
molecular percent Silica 63%
K2O .24
Al2O3 .45
SiO2 3.17
molecular percent Silica 66%
The width of the interaction region is nearly half an inch, comparable to the
width of the original design mask.
The interface in which these two glazes react contains metallic crystals not
seen elsewhere in either glaze.
In addition to the crystals, there are platy artifacts at the edge between
iron_8_R_C10_13PSi and the
then the mask is removed
and the open area filled in with a second glaze.
Close up Images of the interaction region
Image of the piece
bowl with glaze iron_8_R_C10_13PSi and inlay satIron_ZG_1O_1Q_1MFe
pasta bowl is ~9 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
Background glaze
Empirical Formula iron_8_R_C10_13PSi :
Na2O .45
Li2O .25
CaO .17
MgO .02
Fe2O3 .28
Inlay Glaze
Empirical Formula glaze satIron_ZG_1O_1Q_1MFe :
Na2O .22
Li2O .24
CaO .16
MgO .14
Fe2O3 .09
P2O5 0.04
Remarks
This width is determined by the migration
distance of the two glazes and is independent of the width of the mask.
remainder of the interfacial region.