glazes interacting at vertical interface
The matrix (i.e. background) glaze and inlay glaze do not overlap before
firing.
The matrix glaze is a saturated iron glaze. The inlay glaze is a mixed
gloss with microcrystals
Several closeups of the interaction region of the two glazes are shown, and
additionally a closeup
The background glaze is satIron_ZG_Z3N_Z3S, the inlay design is glazed with
hiAlk_Z3P_Z3V_0.
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 1650 deg F then a 3 hr hold at 1650 deg F
400 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 hour hold at 1700 deg F
K2O 0.12
Al2O3 0.76
SiO2 3.70
molecular percent Silica 64%
K2O 0.18
Al2O3 0.64
SiO2 3.54
molecular percent Silica 64.9%
The matrix glaze is phase separated with bubbles forming in the glaze and
micro-crystals forming
Oil and vinegar salad dressing is composed of those two phases, the oil and
the vinegar, each of which retains
containing titanium.
of the matrix glaze. 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
Image of the piece
mug with glaze satIron_ZG_Z3N_Z3S and inlay glaze
hiAlk_Z3P_Z3V_0
mug is ~4 inches high
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 satIron_ZG_Z3N_Z3S:
Na2O 0.57
CaO 0.29
MgO 0.02
Fe2O3 0.24
P2O5 0.08
Inlay Glaze:
Empirical Formula inlay hiAlk_Z3P_Z3V_0:
Na2O 0.41
CaO 0.31
MgO 0.10
P2O5 0.07
TiO2 0.21
Remarks
on the surface of these bubbles which then are
deposited on the surface. The high titanium inlay
glaze diffuses into
the matrix glaze and interacts with these bubbles. The inlay glaze is phase
separated
as well. At the interface of these two glazes, the result of
the interacting of these phases is a
zone caracterized by tendrils of
each glaze penetrating the other.
its own identity in the mix. Up to a
point, sugar dissolves in coffee, beyond that its a separate phase. Iron
crystals in an over-saturated glaze, like too much sugar in the coffee, a
separate phase. Opalescent glazes
can result from liquid
separation into distinct phases.