reacting Glazes
The matrix (i.e. background) glaze and inlay glaze do not overlap before
firing. The width of the
The matrix glaze is high in zinc and even higher in alkali metals. Its surface
is covered in needle-shaped zinc
The inlay glaze is high in silica and alkaline earths and a full gloss. The
thin ribbon of this high silica
The background glaze is cooper_404_1Na_Z45_MZn; the inlay design is glazed with
oribe-woof-MAlk-PPSi. It
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 0.08
Al2O3 0.41
SiO2 2.4
molecular percent Silica 63.1%
added:
1.5% nickel oxide
K2O 0.08
Al2O3 0.29
SiO2 3.45
molecular percent Silica 72.5
Added:
2% Cobalt Carbonate
The inlay interaction region shows a region of what appears to be
liquid-liquid phase separation
Oil and vinegar salad dressing are comprised of two liquids which don't mix
this is two distict liquid phases.
original inlay varied from an eighth of an inch to
three eighths of an inch.
crystals. It is a micro-crystalline matte
glaze featuring two shades of green crystalline inclusions in a yellow
ground.
inlay glaze eats into the background
glaze, creating a wide swath in which floes of half-disolved matrix
crystals
float.
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 cooper_404_1Na_Z45_MZn and inlay glaze 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 cooper_404_1Na_Z45_MZn :
Na2O 0.41
CaO 0.02
MgO 0.01
BaO 0.16
ZnO 0.31
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
- a cloudy irregular flow not seen in
either glaze separately.
The opalescence of chun glazes is the
result of the occurance of liquid-liquid phase separaction.