Glaze Reactions
The background (matrix) glaze is cooper_404_1Na_PZn_hSi; the inlay design is
glazed with
The matrix glaze is derived from Emmanuel Cooper's glaze 404 from his book
Prior examples of this inlay glaze
are seen surrounded by glazes derived from Cooper's glaze 404:
This glaze has more zinc, and more silica than cooper_404_1Na_PMZn. Here the
major difference in the
The matrix (i.e., background) glaze and inlay glaze overlap minimally before
firing. The width of the
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 0.07
Al2O3 0.33
SiO2 2.57
molecular percent Silica 66%
Added:
1.5% Nickel Oxide
K2O 0.10
Al2O3 0.35
SiO2 3.29
molecular percent Silica 70.58%
Added:
5.0% Copper Oxide
oribe-woof-PAl-PSiMg.
"The
Potters Book of Glaze Recipes."
cooper_404_1Na_PMZn
and
cooper_404_Z4E_1 .
interaction region are the striking needle crystals
seen in the first closeup image. As with cooper_404_Z4E_1,
this background
glaze is not as completely dissolved by the inlay glaze as was
cooper_404_1Na_PMZn.
original inlay varied from an eighth of an inch to
three eighths of an inch.
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_PZn_hSi and inlay
oribe-woof-PAl-PSiMg
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 cooper_404_1Na_PZn_hSi :
Na2O 0.26
CaO 0.04
MgO 0.01
BaO 0.19
ZnO 0.43
Inlay Glaze:
Empirical Formula oribe-woof-PAl-PSiMg:
Na2O 0.04
CaO 0.61
MgO 0.25
P2O5 0.01