Glaze Interactions
This is a further exploration of a firing which has a slow up-fire in
addition to having the usual holds
The background glaze has large clusters of micro-crystals in a fluid matrix,
while the inlay glaze is viscous
The matrix (i.e., background) glaze and inlay glaze overlap minimally before
firing. The width of the
The background glaze is oribe-woof-PAlkAl-PSiMg-PZr; the inlay design is
glazed with oribe-satIron-PSi.
The design is created by adhering a mask and then applying the main
glaze. After drying,
The close-up images were heavily edited to enhance detail. The colors of the
full image of the bowl
150 deg F an hour to 250 deg F
300 deg F an hour to 2050 deg F
210 deg F an hour to 2210 deg F then a 1 hr hold at 2210 deg F
90 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 hr hold at 1650 deg F
K2O 0.16
Al2O3 0.36
SiO2 3.3
molecular percent Silica 68.9%
Added:
5.0% Copper Oxide
K2O 0.15
Al2O3 0.52
SiO2 3.9
molecular percent Silica 68.8%
Added:
5.0% Cobalt Carbonate
This firing features a 'rounded at the top' firing profile; with a hold
of an hour 100 degreesF
on the way down.
and minimally melted. The result is that
the background glaze flows through parts of the inlay leaving behind
small disconnected islands. The micro-crystalline clusters in the fluid
matrix of the background glaze
carve ragged accents through the inlay as
they plow through. These clusters act similarly to boulders in a
mud
flow. The patterns of this flow are seen in the close-up images of the
interaction region.
original inlay, which varied from an eighth of
an inch to three quarters of an inch, is considerably thicker than my
usual inlay.
the mask is removed and the open area filled in with a
second glaze, using a bulb syringe
with a needle applicator.
are as they appear in bright light.
Close up Images of the interaction region
Image of the piece
bowl with glaze oribe-woof-PAlkAl-PSiMg-PZr and inlay glaze oribe-satIron-PSi
bowl is ~6 inches in diameter
oxidation firing to almost cone 11 in an electric kiln
Firing profiles
Up Fire profile hot cone 10
Down Fire Profile hot cone 10
Clay body is a grolleg porcelain from Clay Art Center in Tacoma, WA.
glaze composition
Empirical Formula oribe-woof-PAlkAl-PSiMg-PZr :
Na2O 0.05
CaO 0.49
MgO 0.29
P2O5 0.01
ZrO2 0.11
Inlay Glazes:
Empirical Formula oribe-satIron-PSi:
Na2O 0.28
CaO 0.38
MgO 0.19
Fe2O3 0.20
P2O5 0.05
Remarks
below top temperauture, and a slow climb from there to
the top temperature.