Glaze Reactions
The matrix glaze is a saturated iron glaze with leopard spots.
The interaction region is encased in a cloud of silvery-pewter particles
through which peeks the
The matrix (i.e., background) glaze and inlay glaze do not overlap before
firing. The width of the
The background glaze is satIron_ZG_Z3N_EPK; the inlay design is glazed with
oribe-woof-PAl-PSiMg.
The design is created by adhering a mask and then applying the main
glaze. After drying,
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 1850 deg F then a 2 hr hold at 1850 deg F
300 deg F an hour to 1750 deg F then a 1 hr hold at 1750 deg F
300 deg F an hour to 1700 deg F then a 3 hr hold at 1700 deg F
25 deg F an hour to 1650 deg F then a 1 hour hold at 1650 deg F
K2O 0.13
Al2O3 0.73
SiO2 3.65
molecular percent Silica 64.1%
K2O 0.10
Al2O3 0.35
SiO2 3.29
molecular percent Silica 70.58%
Added:
5.0% Copper Oxide
underlying coppery colors of the saturated iron
glaze beneath. Centered within this cloud is a thin
liquid-like flow of
aqua framed in orangey-yellow and brown.
original inlay varied from an eighth of an inch to
three eighths of an inch.
the mask is removed and the open area filled in with a
second glaze, using a bulb syringe
with a needle applicator.
Close up Images of the interaction region
Image of the piece
bowl with glaze satIron_ZG_Z3N_EPK and inlay oribe-woof-PAl-PSiMg
bowl is ~6 inches in diameter
oxidation firing to cone 10 in an electric kiln
Firing profiles
Up Fire profile cone 10
Down Fire Profile cone 10
Clay body is a grolleg porcelain from Clay Art Center in Tacoma, WA.
glaze composition
Empirical Formula satIron_ZG_Z3N_EPK :
Na2O 0.57
CaO 0.28
MgO 0.02
Fe2O3 0.24
P2O5 0.07
Inlay Glaze:
Empirical Formula oribe-woof-PAl-PSiMg:
Na2O 0.04
CaO 0.61
MgO 0.25
P2O5 0.01