One Inlay Glaze

The interface of adjacent glazes.

The interaction region of two glazes. Here I show that two glaze interaction region with six distinct background glazes;
each with the same foreground glaze.

The foreground design for each mug 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,
then the mask is removed and the open area filled in with a second glaze.

In each case the interaction is shown on a mug ~4.5 inches in height.

Image of the pieces

full view

mug with glaze glaze mashiko_satIron_Z2Q and inlay iron_8_R_C10_13PSi

full view

mug with glaze glaze longquan_n_song_Z2G_0PLi_redart and inlay iron_8_R_C10_13PSi

full view

mug with glaze glaze celedon_PA_Z2G_0PLi_NFe and inlay iron_8_R_C10_13PSi

full view

mug with glaze glaze tsabar-harris-y and inlay iron_8_R_C10_13PSi

full view

mug with glaze glaze tsabar-harris-r and inlay iron_8_R_C10_13PSi

full view

mug with glaze glaze tsabar-harris-celedon-PAl and inlay iron_8_R_C10_13PSi

oxidation firing to cone 10 in an electric kiln

Firing profiles

Up Fire profile

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

Down Fire Profile

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

Clay body is a grolleg porcelain from Tacoma Clay Art Center.

glaze compositions

Background glazes

Empirical Formula mashiko_satIron_Z2Q :

K2O        0.10
Na2O        0.30
Li2O        0.16
CaO        0.20
MgO        0.24

Al2O3        0.81
Fe2O3        0.17

SiO2        4.22
P2O5        0.04

molecular percent Silica 68%

Empirical Formula longquan_n_song_Z2G_0PLi_redart :

K2O        0.10
Na2O        0.13
Li2O        0.09
CaO        0.49
MgO        0.10
ZnO        0.09

Al2O3        0.48
Fe2O3        0.015

SiO2        3.76

molecular percent Silica 72%

Added:

0.02% Cobalt Carbonate

0.2% Silicon Carbide for local reduction

Empirical Formula celedon_PA_Z2G_0PLi_NFe :

K2O        0.09
Na2O        0.11
Li2O        0.08
CaO        0.43
MgO        0.21
ZnO        0.08

Al2O3        0.4

SiO2        3.63

molecular percent Silica 72%

Added:

0.02% Cobalt Carbonate

0.2% Silicon Carbide added for local reduction

Empirical Formula tsabar-harris-y :

K2O        0.21
Na2O        0.07
CaO        0.64
MgO        0.01
SrO        0.07

Al2O3        0.52

SiO2        2.93
SnO2        0.05

molecular percent Silica 65%

Added:

0.5% copper Carbonate

0.5% Silicon Carbide added for local reduction

Empirical Formula tsabar-harris-r :

K2O        0.21
Na2O        0.07
CaO        0.65
MgO        0.01
ZnO        0.06

Al2O3        0.51
Fe2O3        0.02

SiO2        2.88

molecular percent Silica 65%

Added:

0.5% Silicon Carbide added for local reduction

Empirical Formula tsabar-harris-celedon-PAl :

K2O        0.21
Na2O        0.07
CaO        0.65
MgO        0.01
ZnO        0.06

Al2O3        0.56
Fe2O3        0.01

SiO2        2.77

molecular percent Silica 63.6%

Added:

0.02% Chrome Oxide

0.5% Silicon Carbide added for local reduction

Inlay Glaze

Empirical Formula iron_8_R_C10_13PSi :

K2O        0.11
Na2O        0.45
Li2O        0.25
CaO        0.17
MgO        0.02

Al2O3        0.56
Fe2O3        0.28

SiO2        3.12

molecular percent Silica 63%

Remarks

The first background glaze, mashiko_satIron_Z2Q, is a saturated iron glaze with similar bases as the inlay glaze iron_8_R_C10_13PSi,
yet stiffer than the inlay glaze as a result of having higher alumina and silica. The resulting inlay migrates little from its original mask,
nor does it appreciably diffuse into the matrix glaze.

The second and third background glazes are celadons. Both have lower alumina and higher silica than the inlay glaze iron_8_R_C10_13PSi,
and thus are more fluid. The result is greater migration of the inlay, both in downward flow and diffusion. The second of the two celadons,
celedon_PA_Z2G_0PLi_NFe has higher silica, so is slightly stiffer. The result the inlay intermixes less with the matrix glaze.

The last three background glazes, tsabar-harris-y, tsabar-harris-r, and tsabar-celadon-PAl are similar glazes, all stiffer than the
preceding two celadon glazes. tsabar-celadon-PAl has higher alumina, and is the most viscous of these three glazes.
The inlay migrates substantially in all three of these glazes, in a similar manner, showing a narrow band
of diffusion above the inlay, and a large band, combining both creep and diffusion, below.

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