Layered Glazes
Here is a high alkali metal glaze layered over a high phosphorus, high alkali
metal glaze. The second glaze is poured over the center of
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 2300 deg F with a hold of 20 minutes at 2300 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
The base glaze with .2 molecular fraction Phosphorus
K2O .11
Al2O3 .6
SiO2 2.95
molecular percent Silica 59.6%
The second glaze
K2O .25
Al2O3 .52
SiO2 3.2
molecular percent Silica 64%
The leaf design is created by embedding a wet leaf in the immediately poured
glaze, waxing the entire plate when dry, removing the leaf,
The entire plate was glaze on the inside with satIron_ZG_0PP, then a second
layer of the glaze satIron_ZG_1O_0 was poured
the plate
extending to the tip of the leaves.
Glaze satIron_ZG_0PP over satIron_ZG_1O_0
plate is ~7 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
Empirical Formula glaze satIron_ZG_0PP :
Na2O .47
Li2O .2
CaO .16
MgO .06
Fe2O3 .2
P2O5 .2
Empirical Formula glaze satIron_ZG_1O_0 :
Na2O .24
Li2O .24
CaO .17
MgO .1
Fe2O3 .21
P2O5 .05
Remarks
then staining the
leaf print with a thinned glaze or oxide wash.
into the center part of the
plate.