A glaze from the interaction region seen
here .
The glaze shown in this note, iron_Alex_0, is a mixture of the two glazes
satIron_ZG_0 and alexanderBowl_0_Z1Y.
The interaction region between the two glazes, satIron_ZG_0 and
alexanderBowl_0_Z1Y fascinates me.
Past experience found the interesting artifacts in the interactions between a
high alkali metal glaze, and a high CaO
This glaze is three quarters satIron_ZG_0, one quarter alexanderBowl_0_Z1Y. I
think of it as "spicing"
bowl is ~ 3.5 inches in diameter.
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 1750 deg F then a half 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 0.08
Al2O3 0.57
SiO2 3.0
molecular percent Silica 63%
K2O 0.1
Al2O3 0.59
SiO2 3.14
molecular percent Silica 63%
K2O .09
Al2O3 .43
SiO2 2.7
molecular percent Silica 65%
The glaze shown here was derived similarly to a previously seen glaze
satIron_P_Alex.
The acicular crystals seen in this glaze are similar to those seen in
satIron_P_Alex, though the
The acicular micro-crystals are large only if the glaze is thickly applied,
whence it runs badly,
The crystals are nearly ~1/4 inch in diameter. These micro-crystals while
small, are visible.
This time, I didn't bother with the line
blend, rather as they say, threw a dart into a black hole.
semi-matte glaze, nearer the high
alkali metal end of things. So that's what I did.
the glaze satIron_ZG_0, with a bit of
alexanderBowl_0_Z1Y.
Image of the glaze iron_Alex_0
inside
outside
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
Empirical Formula iron_Alex_0 :
Na2O 0.37
Li2O 0.14
CaO 0.32
MgO 0.09
Fe2O3 0.15
P2O5 0.03
Empirical Formula satIron_ZG_0 :
Na2O 0.49
Li2O 0.19
CaO 0.16
MgO 0.06
Fe2O3 0.20
P2O5 0.04
Empirical Formula alexanderBowl_0_Z1Y :
Na2O .05
CaO .70
MgO .16
Fe2O3 0.02
Remarks
resemblance between these two glazes ends
there. The glaze iron_Alex_0 sports, in addition to the largish acicular
crystals,
a scattering of metallic yellow micro-crystals and various other
crystalline precipitates.
and the background glaze is entirely eaten by the
crystals. This glaze is a work in progress.