Migrating abutting glazes
The interface of adjacent glazes.
Several closeups of the interaction region of the two glazes are shown and,
for context, a picture of the pot.
The background glaze is paperWhite_P_celedon with cobalt; the foreground design is
glazed with iron_8_R_C10_13PSi.
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 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
K2O 0.05
Al2O3 0.58
SiO2 3.40
molecular percent Silica 66%
added:
1% Cobalt Carbonate
K2O 0.11
Al2O3 0.56
SiO2 3.12
molecular percent Silica 63%
The inlay glaze is a saturated iron glaze high in alkali metals containing
CaO; The background glaze contains Barium,
Micro-crystals grow more profusely in the interaction region than in
either background or foreground glaze,
Some sections of inlay are entirely consumed into the interaction region.
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
mug with glaze glaze paperWhite_P_celedon and inlay iron_8_R_C10_13PSi
mug is ~5.5 inches high
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 paperWhite_P_celedon :
Na2O 0.17
Li2O 0.19
CaO 0.06
MgO 0.05
BaO 0.24
SrO 0.24
TiO2 0.15
Inlay Glaze
Empirical Formula iron_8_R_C10_13PSi :
Na2O 0.45
Li2O 0.25
CaO 0.17
MgO 0.02
Fe2O3 0.28
Remarks
Strontium, Titanium, and
moderate alkali metals. The background glaze is viscous,
the inlay glaze
fluid.
and dominate the interaction region.