Interaction of Two Glazes
I show the interaction of two glazes applied side by side.
There are two pairs of glazes shown, In each case, I show close up images of
the interface, and a picture of the pot to give context.
The decoration glaze is filled in an area masked prior to the
pouring of the background layer of glaze.
When dry, the base glaze was then convered with an emulsion waxy prior to
stripping the mask and filling in the decoration glaze.
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
A one hour hold at 1750 deg F
A three hour hold at 1700 deg F
A two hour hold at 1650 deg F
K2O .004
Al2O3 .54
SiO2 3.56
molecular percent Silica 65%
K2O .10
Al2O3 .73
SiO2 4.1
molecular percent Silica 67%
K2O .14
Al2O3 .78
SiO2 4.2
molecular percent Silica 68%
K2O .08
Al2O3 .6
SiO2 4.37
molecular percent Silica 69%
cone 10 oxidation
Firing profile
Up Fire profile
Down Fire Profile
The cones show this as a hot cone 10 firing.
Clay body is a grolleg porcelain from Tacoma Clay Art Center.
glaze compositions
Emperical Formula satIron_ZT_MashikoLi:
Na2O .006
Li2O .223
CaO .516
MgO .251
Fe2O3 .21
P2O5 .17
Emperical Formula nepheline_Z1A_1E_1:
Na2O .68
CaO .06
MgO .16
Fe2O3 .25
Emperical Formula nepheline_Z1A_1G_2:
Na2O .57
Li2O .06
CaO .06
MgO .17
Fe2O3 .22
Emperical Formula satIron_ZT_Mashiko:
Na2O .08
Li2O .17
CaO .5
MgO .17
Fe2O3 .23
P2O5 .16
background glaze satIron_ZT_MashikoLi inlay nepheline_Z1A_1E_1
Close up Images of various of the markings
Image of the whole piece
bowl with glaze satIron_ZT_MashikoLi inlay nepheline_Z1A_1E_1
background glaze nepheline_Z1A_1G_2 inlay satIron_ZT_Mashiko
Close up Images of various of the markings
Image of the whole piece
bowl with glaze nepheline_Z1A_1G_2 inlay satIron_ZT_Mashiko