Reacting glazes at a vertical interface
Glazes interacting at a vertical interface.
The matrix (i.e. background) glaze and inlay glaze do not overlap before
firing.
Both the matrix and inlay glaze are high in alkali metals, which results in low
viscosity, fluid glazes.
The result of the high fluidity of both matrix and inlay glazes is a dynamic
flow pattern in the inlay and
Several closeups of the interaction region of the two glazes are shown and,
for context, a picture of the pot.
The background glaze is iron_satIron_Z2V_0PP_MFe, the inlay design is
glazed with alk_179_1_Z30_0Var.
The design is created by adhering a mask and then applying the main
glaze. After drying, the mask is removed
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 0.11
Al2O3 0.56
SiO2 3.21
molecular percent Silica 63.3%
K2O 0.17
Al2O3 0.53
SiO2 2.43
molecular percent Silica 58.4%
For these two fluid glazes, the driving force for interaction is the high
mobility of both glazes,
The extra flow of inlay into matrix caused the glaze to flow substantially at
the bottom of the pot.
The original mask for the inlay was a simple curved line, nowhere
more than three eights of an inch thick.
The matrix glaze contains substantial Phosphorus;
the inlay glaze contains substantial Magnesium
and some Barium, but minimal
Calcium. The inlay glaze is low in Silica and high in Titanium.
interaction region, whose general form is only
minimally related to the original masks.
and the open area filled in with a
second glaze, using a bulb syringe with a needle applicator.
Close up Images of the interaction region
--
Image of the piece
mug with glaze iron_satIron_Z2V_0PP_MFe and inlay glaze alk_179_1_Z30_Var.
mug is ~4.5 inches in 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 iron_satIron_Z2V_0PP_MFe :
Na2O 0.37
Li2O 0.28
CaO 0.19
MgO 0.05
Fe2O3 0.10
P2O5 0.17
Inlay Glaze
Empirical Formula satIron_ZG_1S_1Munge_3MMg_0:
Na2O 0.19
Li2O 0.25
CaO 0.02
MgO 0.27
BaO 0.10
Fe2O3 0.04
TiO2 0.16
Remarks
the low viscosity of each allows them to move
into each other as easter egg dye in water.
The pot stuck to the kiln shelf.