Glaze Reactions
The matrix glaze is a titanium microcrystalline matte glaze.
The interaction region is encased in a cloud of silvery-pewter particles which
form multiple
The matrix (i.e., background) glaze and inlay glaze do not overlap before
firing. The width of the
The background glaze is hiAlk_Z3P_Z4A; 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 0.11
Al2O3 0.56
SiO2 2.95
molecular percent Silica 61.7%
K2O 0.10
Al2O3 0.35
SiO2 3.29
molecular percent Silica 70.58%
Added:
5.0% Copper Oxide
One asks how it is that there are white dendritic rutile tendrils growing into
the inlay, yet grey rutile
The colors in the inlay are created by cross diffusion of the oxides in the
inlay glaze and the oxides
This is cross diffusion, the movement of individual particles. The titanium
particles, once arrived
band surrounding the last bit of the copper green glossy
inlay glaze. The bands moving out
from the central green inlay
to the white matrix are successively white, olive green, brown, and
orangey-brown, followed by a last band of white preceding the silvery
pewter particles.
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 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 :
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
Remarks
micro-crystalline clusters at the boundary
between the full flowering of the inlay glaze and the matrix glaze.
i.e. why is the rutile white near the inlay, grey near the matrix?
in the matrix glaze. The copper moves out of
the inlay glaze in individual copper particles; likewise the
titanium in
the matrix glaze moves by individual titanium particles into the inlay. These
particles
move past each other, not interacting directly with each other.
at the inlay find each other and grow into the
dendritic tendrils seen at the edge of the inlay.
Meanwhile the copper
moving into the matrix diffused into existing micro-crystalline clusters
within
the matrix, which are colored as seen.