Effect of underlying clay body
The glaze hiAlk_satIron_P24 on two different clay bodies.
Fired on a stoneware clay with tooth, with sharp particles sticking up from the
clay body,
Fired on a smooth porcelain body, the glaze is a smooth and featureless
orangey-brown, with
Both of these pots have an inlay design. The background glaze is
hiAlk_satIron_P24;
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
300 deg F an hour to 1800 deg F
200 deg F an hour to 2050 deg F
120 deg F an hour to 2320 deg F with a hold of 25 minutes at 2320 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 hr hold at 1650 deg F
K2O 0.12
Al2O3 0.62
SiO2 3.28
molecular percent Silica 63.3%
K2O 0.17
Al2O3 0.35
SiO2 3.3
molecular percent Silica 70.68%
Added:
5.0% Copper Oxide
this glaze contains orangey-yellow micro-crystalline clusters and a
prominent glassy phase. These
particles of grog or sand act as sites for
nucleation of crystal clusters.
no micro-crystalline clusters. There is nowhere for
these crystal clusters to begin their growth.
the inlay design is glazed with oribe-woof-PAlkAl-PSiMg
the mask is removed and the open area filled in with a
second glaze, using a bulb syringe
with a needle applicator.
The Glaze hiAlk_satIron_P24
On Porcelain
On Stoneware
bowl is ~11 inches in diameter
oxidation firing to cone 10 in an electric kiln
Firing profiles
Up Fire profile hot cone 10
Down Fire Profile hot cone 10
Clay bodies are a grolleg porcelain, and a white stoneware from Clay Art
Center in Tacoma, WA.
glaze composition
Empirical Formula hiAlk_satIron_P24 :
Na2O 0.54
CaO 0.32
MgO 0.02
Fe2O3 0.10
P2O5 0.07
TiO2 0.11
Inlay Glazes:
Empirical Formula oribe-woof-PAlkAl-PSiMg:
Na2O 0.05
CaO 0.49
MgO 0.29
P2O5 0.01