A lusterous surface film
A glaze with a prismatic surface luster and needle crystals.
The surface film reflects rainbow colors; the needle crystals fan out,
resembling snow flakes
Several closeups of the surface and its crystals are shown, as well as a
picture of the bowl.
The bowl has an inlay of a viscous contrast glaze.
The design is created by adhering a mask and then applying the main
glaze. After drying,
bowl is ~ 6 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 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 one hour hold at 1650 deg F
K2O 0.13
Al2O3 0.88
SiO2 3.49
molecular percent Silica 62.2%
K2O 0.18
Al2O3 0.71
SiO2 2.52
molecular percent Silica 57.1%
and flowers.
the mask is removed and the open area filled in with a
second glaze, using a bulb syringe
with a needle applicator.
Images of the surface and its crystals
Image of the glaze longquan-iron-shino-Z3N-0 with inlay inlay_Z3N_0
inside
outside
oxidation firing to cone 10 in an electric kiln
Firing profile
Up Fire profile cone 10
Down Fire Profile cone 10
Clay body is a grolleg porcelain from Tacoma Clay Art Center.
glaze compositions
Background Glaze:
Empirical Formula longquan-iron-shino-Z3N-0:
Na2O 0.47
CaO 0.28
MgO 0.12
Fe2O3 0.16
P2O5 0.08
Inlay Glaze:
Empirical Formula inlay_Z3N_0:
Na2O 0.78
CaO 0.02
MgO 0.02
Fe2O3 0.02
P2O5 0.17