More Reactions between adjoining glazes
The interaction between two adjacent glazes.
Several closeups of the interaction region of the two glazes are shown and,
for context, a picture of the pot.
The design is created by adhering a mask and then applying the main
glaze. After drying, the entire pot is coated in wax,
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
K2O .08
Al2O3 .73
SiO2 4.02
molecular percent Silica 67%
K2O .24
Al2O3 .45
SiO2 3.17
molecular percent Silica 66%
The width of the interaction region is nearly half an inch. The glaze
satIron_ZG_1O_1Q_1MFe migrates rapidly,
The interface in which these two glazes react contains a range of colors not
seen elsewhere in either glaze.
then the mask is removed
and the open area filled in with a second glaze.
Close up Images of the interaction region
Image of the piece
bowl with glaze nepheline_Z1A_2MAlk and inlay satIron_ZG_1O_1Q_1MFe
pasta bowl is ~9 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
Background glaze
Empirical Formula nepheline_Z1A_2MAlk :
Na2O .52
Li2O .06
CaO .11
MgO .23
Fe2O3 .22
Inlay Glaze
Empirical Formula glaze satIron_ZG_1O_1Q_1MFe :
Na2O .22
Li2O .24
CaO .16
MgO .14
Fe2O3 .09
P2O5 0.04
Remarks
like ink on wet paper.
The two glazes react dynamically, musical
chairs for oxides; the music stops at the glass transition temperature, where
all freezes. A mixture of the two glazes will bear no resemblance to that
which is seen in this interface.