Crazy Orange
Two glazes with crazy orange markings.
These glaze are high in Alkali metals, with a low silica:alumina ratio.
Both of these glazes contain trisodium phosphate, a soluble material, which
once mixed with water can not be decanted
bowl is ~ 4 inches in diameter.
bowl is ~ 4 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 1800 deg F then a 2 hr hold at 1800 deg F
300 deg F an hour to 1750 deg F then a 1 hr hold at 1750 deg F
50 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 0.11
Al2O3 0.79
SiO2 2.85
molecular percent Silica %
K2O 0.07
Al2O3 0.63
SiO2 2.08
molecular percent Silica 52.6%
from the glaze. In both of these
cases, in the effort to dissolve the TSP in boiling water before adding other
materials,
too much water was added. In desperation, I poured a big puddle of
glaze into the bottom of each test pot. the bubbled mess you
see is the
result, however, it includes that bit of elusive crazy orange.
Image of the glaze caAlSi_sh_Z3K
Image of the glaze loSi_Z3K
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 caAlSi_sh_Z3K :
Na2O 0.67
CaO 0.21
MgO 0.01
Fe2O3 0.03
P2O5 0.11
Empirical Formula loSi_Z3K :
Na2O 0.90
CaO 0.02
MgO 0.01
Fe2O3 0.01
P2O5 0.23