shino
This glaze is a high in alumina, with a silica:alumina ratio approaching
that of a clay. It achieves this level of alumina with high clay and mica.
This glaze gets its phosphorus from triSodium phosphate (TSP).
inside of bowl:
Outside of bowl:
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
Bentonite 2
K2O .13
Al2O3 1.15
SiO2 3.2
molecular percent Silica 57%
If applied thinly, as on parts of the outside of the bowl, the result is smooth and
stony.
If applied thickly as on the inside of the bowl, the result is pebbly, yet
smooth to the fingers.
The trisodium phosphate is not throughly mixed into the glaze resulting in the
fully melted glossy yellow dots.
shino_Z2D_0
bowl is ~3 inches in diameter
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
Recipe glaze shino_Z2D_0 :
EPK Kaolin 21
EPK Calcined 24
Lithium Carbonate 4
Mica 22
Silica 11
Trisodium Phosphate 16
Empirical Formula glaze shino_Z2D_0 :
Na2O .62
Li2O .23
CaO .01
MgO .01
Fe2O3 .004
P2O5 0.21
Remarks
The colors are intensified by the high level of
phosphorus.