Glaze Interactions
This is a further exploration of a firing which has a slow up-fire in
addition to having the usual
The matrix glaze, oribe-woof-PAlkAl-PSiMg-PZr is a high silica/low alumina
gloss glaze, with
A combination of a similar matrix glaze and the same inlay glaze has
been seen
here, with the
The inlay glaze has large micro-crystalline clusters which form a cellular
structure; this is seen
Individual acicular crystals with radiating needles are seen in the inlay glaze.
The matrix (i.e., background) glaze and inlay glaze overlap minimally before
firing. The width of the
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
400 deg F an hour to 1800 deg F
300 deg F an hour to 2050 deg F
200 deg F an hour to 2220 deg F then a 90 min hold at 2220 deg F
120 deg F an hour to 2320 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 0.17
Al2O3 0.36
SiO2 3.29
molecular percent Silica 68.9%
Added:
5.0% Copper Oxide
K2O 0.13
Al2O3 0.63
SiO2 3.36
molecular percent Silica 63.6%
This firing features a 'rounded at the top' firing profile; with a hold of an
hour and a half at 100 degreesF
holds on the way down.
micro-crystals. The inlay glaze,
satIron_ZG_Z3N_Z4A_0+hiAlk_Z3P_Z4E, is a titanium bearing
saturated iron
glaze, which contributes its own distinct crystals.
same retarded up-fire. A small change in the
composition of the matrix glaze had a profound effect
on the interaction
between the two glazes.
most clearly in the last of the close-up images.
These clusters are nestled against each other, but
not tightly bonded.
The fluid background glaze is seen to flow between these clusters, isolating
them
as separate islands. This is seen in the first of the close-up
images.
original inlay varied from an eighth of
an inch to three quarters 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.
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 satIron_ZG_Z3N_Z4A+hiAlk_Z3P_Z4E
bowl is ~6 inches in diameter
oxidation firing to a hot cone 10 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 Glaze:
Empirical Formula satIron_ZG_Z3N_Z4A+hiAlk_Z3P_Z4E:
Na2O 0.52
CaO 0.33
MgO 0.02
Fe2O3 0.11
P2O5 0.07
TiO2 0.12
Remarks
below top temperature, and a slow climb
from there to the top temperature.