Reactions at the interface between two glazes
The interaction at 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 hankPaper_Z1R_2C_1, the foreground design is
glazed with mashiko_ZJ_0_N.
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 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 .13
Al2O3 .42
SiO2 2.7
1% Cobalt Carbonate, and 0.67% Copper Carbonate have been added to the base glaze.
molecular percent Silica 63%
K2O .12
Al2O3 .82
SiO2 5.68
molecular percent Silica 73%
The interaction region dominates the design, leaving only scattered bits
of the design glaze inlay. The background glaze ate into
The design glaze, mashiko_ZJ_0_N is a stiff high alumina saturated iron oil spot
glaze. The background glaze is lower in alumina and contains
These are dissimilar in character which results in an interaction region which
is unlike either glaze,
The background glaze has migrated throughout the inlay glaze, as is seen in
the occurance of orange within the inlay.
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 hankPaper_Z1R_2C_1 and inlay mashiko_ZJ_0_N
bowl is ~6 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 hankPaper_Z1R_2C_1 :
Na2O .12
Li2O .04
CaO .14
MgO .02
BaO .31
SrO .24
TiO2 .14
Inlay Glaze
mashiko_ZJ_0_N :
Na2O .11
Li2O .10
CaO .26
MgO .41
Fe2O3 .23
Remarks
the design glaze
creating the baroque curlicues in the design.
both barium and
strontium.
both in range of colors and texture.