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 hiCa-chrome-Z2O-half-M; 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 0.41
SiO2 2.58
molecular percent Silica 62%
Added:
0.2% Chrome oxide
This is a chrome pink glaze
K2O 0.11
Al2O3 0.56
SiO2 3.12
molecular percent Silica 63%
The
inlay glaze is higher in alkaline metals, silica and alumina, while background
glaze is high in CaO.
The mask for the inlay is a spiral, almost the entire area within the outer
spiral is a mix of
There are several different crystals growing in the interfacial region.
The first of the interface images has been heavily edited in an attempt to
increase the visibility
I see those mustard yellow crystals growing in the interface of
iron_8_R_C10_13PSi and almost any other 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 glaze hiCa-chrome-Z2O-half-M and inlay iron_8_R_C10_13PSi
bowl is ~7 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 hiCa-chrome-Z2O-half-M :
Na2O 0.15
CaO 0.78
MgO 0.02
SnO2 0.13
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
Both these glazes are exceedingly fluid.
inlay glaze and matrix glaze.
of the radial lines in the orangey crystals
near the upper left corner.
I've no idea what those
crystals are, would love to have a glaze of that color.