glazes interacting at vertical interface
The matrix (i.e. background) glaze and inlay glaze do not overlap before
firing.
The matrix glaze is a high alkali metal glaze containing titanium. The inlay
glaze is a micro-crystalline glaze
Cross diffusion of the matrix glaze into the inlay and the inlay into the
matrix glaze creates contrasting
The alkalis of the matrix diffuse into the inlay, the silica and alkaline
earths correspondingly
Several closeups of the interaction region of the two glazes are shown. For
context, a picture of the
The background glaze is hiAlk_Z3P_MAl; the inlay design is glazed with
oribe-woof-MAlk-PPSi.
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 0.12
Al2O3 0.60
SiO2 3.28
molecular percent Silica 63.4%
K2O 0.08
Al2O3 0.29
SiO2 3.45
molecular percent Silica 72.5
Added:
2% Cobalt Carbonate
With titanium, calcium, phosphorus and zirconium, there are ample sources for
the micro-crystals seen in the
high in silica and low in alumina
containing copper, cobalt and zirconia.
bands of reactions, with the growth
of diverse crystals.
move into the matrix glaze.
pot is shown. These closeups are heavily
edited to make the artifacts in the interaction region visible.
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_MAl and inlay glaze
oribe-woof-MAlk-PPSi
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 grolleg porcelain from Clay Art Center in Tacoma, WA.
glaze composition
Empirical Formula hiAlk_Z3P_MAl :
Na2O 0.51
CaO 0.35
MgO 0.02
P2O5 0.06
TiO2 0.22
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
Remarks
interaction region. The dark cloud surrounding
the inaly could be diffusion of either copper or cobalt into the matrix glaze.