micro crystals
A glaze with the micro-crystals in the interaction region seen
The glaze shown in this note, satIron_P_Alex, is a mixture of the two glazes
satIron_ZG_Ip7_5 and alexanderBowl_0_Z1Y.
It is a glaze from a seven-tile line blend with left end satIron_ZG_Ip7_5 and
right end alexanderBowl_0_Z1Y. It has the composition
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 0.65
SiO2 3
molecular percent Silica 63%
K2O .07
Al2O3 .71
SiO2 3.13
molecular percent Silica 63%
K2O .09
Al2O3 .43
SiO2 2.7
molecular percent Silica 65%
The acicular crystals seen in this glaze have a pink tint and a uniform
color, in contrast to the varigated yellow-brown
The crystals are surrounded by a brown halo, an indication that some component
of the glaze is pushed out in front of the
The crystals are ~1/8 inch in diameter. These micro-crystals while small, are
visible.
of the first tile
to the right of satIron_ZG_Ip7_5. Its recipe is five parts Left end and one
part Right end.
Image of the glaze satIron_P_Alex
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 satIron_P_Alex :
Na2O 0.36
Li2O 0.16
CaO 0.23
MgO 0.17
Fe2O3 0.09
P2O5 0.03
Empirical Formula satIron_ZG_Ip7_5 :
Na2O .44
Li2O .2
CaO .12
MgO .17
Fe2O3 .1
P2O5 0.04
Empirical Formula alexanderBowl_0_Z1Y :
Na2O .05
CaO .70
MgO .16
Remarks
seen in the interface of
the two glaze satIron_ZG_Ip7_5 and alexanderBowl_0_Z1Y.
interface of the growing crystals
and matrix.