More Snow Flake
Here are three snowflake glazes (glazes containing rutile micro-crystalline
clusters). These glazes
The degree to which the rutile micro-crystals dominate the appearance varies
substantially more than
If applied thickly, glaze #1 shows a flat white micro-crystalline surface with
only hints of a transparent
Glaze #2 exhibits a translucent surface with a lacy network of
micro-crystalline threads,
Glaze #3 has tight micro-crystalline clusters in a large clear translucent
glassy ground.
The most prominent difference in composition is the silica:alumina ratio:
hiAlk_Z3P_Z4E_0 5.18
One can speculate that low silica alumina ratio so decreases solubility of the
crystalline phase that
Additionally, the lower alumina of hiAlk_Z3P_Z4E_1 increases the fluidity of
the glaze enhancing the
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 0.10
Al2O3 0.58
SiO2 2.98
molecular percent Silica 61.7%
K2O 0.11
Al2O3 0.57
SiO2 3.11
molecular percent Silica 62.7%
K2O 0.11
Al2O3 0.55
SiO2 3.21
molecular percent Silica 63.7%
hiAlk_Z3P_Z3E_0, hiAlk_Z3P_Z3E, and
hiAlk_Z3P_Z3E_1, will be referred to as glaze #1, glaze #2
and glaze #3.
the difference in composition.
substrate. The micro-crystalline clusters
merge over much of the surface of the pot.
overlaid by micro-crystalline assemblages that
are comprised of shaggy mounds that mimic
appearance of the floppy wet
snow which falls near freezing when the weather isn't decided, snow
vs. rain.
hiAlk_Z3P_Z3E 5.43
hiAlk_Z3P_Z4E_1 5.85
like sugar in cold coffee, it is forced out.
ability of the crystal forming species to flock
together in the glaze.
Image of the glaze hiAlk_Z3P_Z3E_0
inside
outside
Image of the glaze hiAlk_Z3P_Z4E
inside
outside
Image of the glaze hiAlk_Z3P_Z4E_1
inside
outside
bowls are ~3.5 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 compositions
Empirical Formula hiAlk_Z3P_Z4E_0 :
Na2O 0.48
CaO 0.40
MgO 0.02
P2O5 0.06
TiO2 0.21
Empirical Formula hiAlk_Z3P_Z4E :
Na2O 0.50
CaO 0.37
MgO 0.02
P2O5 0.06
TiO2 0.22
Empirical Formula hiAlk_Z3P_Z4E_1 :
Na2O 0.48
CaO 0.39
MgO 0.02
P2O5 0.06
TiO2 0.22