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 an oil spot glaze, with rather strangely configured spots.
The inlay glaze is a
Several closeups of the interaction region of the two glazes are shown, and
additionally closeups of the matrix glaze.
The background glaze is longquan_iron_mashiko_0, the inlay design is
glazed with iron_Alex_1MFe_0.
The design is created by adhering a mask and then applying the main
glaze. After drying,
There are two images abutting at a vertical line.
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 1800 deg F then a two hour hold at 1800 deg F
300 deg F an hour to 1750 deg F then a one hour 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 0.11
Al2O3 0.71
SiO2 4.27
molecular percent Silica 69%
K2O 0.07
Al2O3 0.53
SiO2 3.0
molecular percent Silica 65.3%
Note the nearly translucent patches in the interaction region.
The matrix glaze is higher in silica, alumina and alkali metals, than the inlay
glaze. The differing composition
microcrystalline matte. It is seen
here with higher iron.
For context, a picture of the
pot is shown.
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
Close up Images of the matrix glaze
Image of the piece
bowl with glaze longquan_iron_mashiko_0 and inlay glaze
iron_Alex_1MFe_0.
inside of bowl
bowl is ~6 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 longquan_iron_mashiko_0:
Na2O 0.45
Li2O 0.15
CaO 0.11
MgO 0.18
Fe2O3 0.19
Inlay Glaze
Empirical Formula iron_Alex_1MFe_0:
Na2O 0.34
Li2O 0.11
CaO 0.37
MgO 0.11
Fe2O3 0.04
P2O5 0.02
Remarks
allows the formation of phases present in
neither of these glazes.