Interacting glazes at a vertical interface
Glazes interacting at a vertical interface.
The matrix (i.e. background) glaze and inlay glaze do not overlap before
firing.
The matrix glaze is a high alkali saturated-iron with metallic
micro-crystals. The inlay glaze
This same pair of matrix glaze and inlay glaze are seen
here with a substantially thinner application of the
Several closeups of the interaction region of the two glazes are shown, and
additionally a closeup
As a consequence of the extra volume of matrix glaze, there is sufficient
matrix glaze to absorb almost the
The background glaze is iron_satIron_Z2V_0, the inlay design is
glazed with hankPaper_Z1R_2C_1Var.
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
200 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 1750 deg F then a 50 minute hold at 1750 deg F
300 deg F an hour to 1700 deg F then a three hour hold at 1700 deg F
25 deg F an hour to 1650 deg F then a one hour hold at 1650 deg F
K2O 0.19
Al2O3 0.55
SiO2 3.17
molecular percent Silica 63.8%
K2O 0.13
Al2O3 0.43
SiO2 2.7
molecular percent Silica 63.4%
Added:
Cobalt Carbonate 1%
Note the translucent acicular crystals which show the colors of the glaze beneath.
is a microcrystalline matte containing
both barium and strontium.
matrix glaze.
of the matrix glaze. For context, a picture of the
pot is shown.
entirety of the applied inlay glaze.
There remain only remnants of the intact inlay glaze. The large roll of
glaze
at the bottom of the pot attests to the quantity of matrix glaze on the
pot. The matrix glaze is
sufficiently viscous, that had the matrix glaze
been applied graduated, thinner toward the bottom of
the bowl, there would
have been no flow of glaze on the kiln shelf.
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 iron_satIron_Z2V_0 and inlay glaze
hankPaper_Z1R_2C_1Var.
bowl is ~7.5 inches in diameter
oxidation firing to cone 10 in an electric kiln
Firing profiles
Up Fire profile
Down Fire Profile
Clay body is a grolleg porcelain from Tacoma Clay Art Center.
glaze compositions
Background glaze
Empirical Formula iron_satIron_Z2V_0 :
Na2O 0.30
Li2O 0.27
CaO 0.18
MgO 0.06
Fe2O3 0.20
P2O5 0.04
Inlay Glaze
Empirical Formula hankPaper_Z1R_2C_1Var:
Na2O 0.12
Li2O 0.05
CaO 0.14
MgO 0.01
BaO 0.31
SrO 0.24
TiO2 0.14
Copper Carbonate 0.5%
Remarks