Glaze Reactions
The background (matrix) glaze is hiAlk_Z3P_Z4A_PF; the inlay design is
glazed with
A previous pot seen
seen here: is glazed with a related high titanium glaze,
hiAlk_Z3P_Z4A, and
Here, the background glaze hiAlk_Z3P_Z4A_PF, with slightly less
alumina than hiAlk_Z3P_Z4A,
Relics of these micro-crystalline clusters, the snow flakes, are seen
as isolated dark disks
The inlay glaze diffuses into the background glaze, and reacts with
the fluid substrate to
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,
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 0.11
Al2O3 0.55
SiO2 2.95
molecular percent Silica 61.9%
K2O 0.10
Al2O3 0.35
SiO2 3.29
molecular percent Silica 70.58%
Added:
5.0% Copper Oxide
oribe-woof-PAl-PSiMg. The matrix glaze is a titanium
microcrystalline matte glaze with snow flakes.
the same inlay glaze. That glaze, hiAlk_Z3P_Z4A, has
higher Alumina, and as a result is stiffer.
shows a fluid substrate, and disconnected
rutile micro-crystalline clusters, which I have characterized
as snow
flakes. This in contrast to the dense micro-crystalline matte glaze
hiAlk_Z3P_Z4A, in
which no glassy regions are seen.
in the interaction region.
produce an amber glassy region with scattered
shaggy irregular greyish-white micro-crystals.
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 hiAlk_Z3P_Z4A_PF 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 white stoneware from Clay Art Center in Tacoma, WA.
glaze composition
Empirical Formula hiAlk_Z3P_Z4A_PF :
Na2O 0.48
CaO 0.39
MgO 0.02
P2O5 0.06
TiO5 0.21
Inlay Glaze:
Empirical Formula oribe-woof-PAl-PSiMg:
Na2O 0.04
CaO 0.61
MgO 0.25
P2O5 0.01