Glaze Reactions
The background glaze hiAlk_Z3P_Oribe_L features large tan micro-crystalline
clusters in a
The inlay is full gloss with prominent flow patterns, and the interaction
region features lacy
This glaze has been seen previously
here where it had significantly more copper.
The difference between these two glazes is the quantity of copper oxide which
was nearly
From the effect of the diffused inlay into the matrix glaze, I conclude that
the difference in the
The higher alumina matrix glaze has high viscosity, additionally the large
micro-crystalline clusters
The matrix (i.e. background) glaze and inlay glaze do not overlap before
firing. The width of the
The background glaze is hiAlk_Z3P_Oribe_L; the inlay design is glazed with
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 0.54
SiO2 3.31
molecular percent Silica 65.01%
added:
1% copper oxide
K2O 0.08
Al2O3 0.29
SiO2 3.45
molecular percent Silica 72.5
Added:
2% Cobalt Carbonate
semi-gloss olive matrix. These clusters have perhaps 50%
surface coverage.
fingerlings of indeterminate opaque white material.
The tan
micro-crystalline clusters seen in this current note replace the large deep
grey clusters
that nearly covered the surface of the prior glazed pot.
tripled in the prior view. Along parts of the inlay, the
brooding immense crystal clusters are seen,
the matrix having received
diffused copper from a high copper inlay.
texture of the glazes hiAlk_Z3P_Oribe with high copper,
and hiAlk_Z3P_Oribe_L with low copper is
attributable to the difference in the
quantity of copper in the two glazes.
impede movement within the glaze. While the inlay
has spread some beyond its original position
marked by the design masks, its
final position is at most double its original width.
original inlay varied from an eighth of an inch to
three eighths of an inch.
oribe-woof-MAlk-PPSi. It had cobalt and Zircopax added casually, that
is a splash,
not measured.
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_Oribe_L with inlay oribe-woof-MAlk-PPSi
bowl is ~7 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 grolleg porcelain from Clay Art Center in Tacoma, WA.
glaze composition
Empirical Formula hiAlk_Z3P_Oribe_L :
Na2O 0.45
CaO 0.40
MgO 0.04
P2O5 0.52
TiO2 0.18
Inlay Glaze:
Empirical Formula oribe-woof-MAlk-PPSi:
Na2O 0.03
CaO 0.72
MgO 0.17
P2O5 0.01
5.0% Copper Oxide
5% Zircopax