iron colors
Here is a high alkali metal saturated iron glaze with a high alkaline earth
inlay glaze. The background
The background glaze is variegated, and comprised of red, orange and metallic
coppery micro-crystals
The design is created by adhering a mask and then applying the main
glaze. After drying,
The matrix (i.e., background) glaze and inlay glaze do not overlap before
firing. The width of the
The background and inlay glazes nearly abut; and the design didn't broaden
particularly, yet the
The black edge of the inlay is the effect of the inlay glaze on the iron of
the background 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 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 0.07
Al2O3 0.51
SiO2 3.51
molecular percent Silica 66.5%
K2O 0.08
Al2O3 0.29
SiO2 3.70
molecular percent Silica 72.3%
added:
0.5% chrome oxide
glaze is satIron_ZG_7_MLiAlk; the inlay design is
glazed with oribe-woof-munge.
in a tan ground. This is seen in a close-up of the
background glaze.
the mask is removed and the open area filled in with a
second glaze, using a bulb syringe
with a needle applicator.
original inlay varied from an eighth of an inch to
three eighths of an inch.
distance of the interaction region exceeds the
width of the inlay.
This black color is seen beneath the coppery
colored micro-crystals of the background glaze for a
distance almost the
width of the inlay. Tendrils of dark green extending within the inlay from its
edge
show iron diffusing into the inlay from the background glaze. This
is shown in close-ups of
the glaze and inlay.
close ups of the glaze satIron_ZG_7_MLiAlk and inlay oribe-woof-Munge
close up of the glaze satIron_ZG_7_MLiAlk
Image of the bowl
inside
outside
bowl is ~5 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 white stoneware from Clay Art Center in Tacoma, WA.
glaze compositions
Empirical Formula satIron_ZG_7_MLiAlk :
Na2O 0.56
CaO 0.23
MgO 0.14
Fe2O3 0.21
P2O5 0.04
Empirical Formula oribe-woof-munge :
Na2O 0.03
CaO 0.72
MgO 0.17
P2O5 0.03