Glaze Interactions

I show the interaction of two glazes applied side by side, with neither overlap nor gap between them. An interfacial region developed

between the contrast inlay glaze and the background glaze. I show a close up of that interface, and also to give context,

a picture of the pot.

The markings on the outside of the deep bowl are a second glaze inlay. The glaze is filled in to an area that had been masked prior to

the pouring of the first layer of glaze. It was then waxed with an emulsion wax prior to stripping the mask.

The Firing profile

Up Fire profile

150 deg F an hour to 250 deg F

400 deg F an hour to 2060 deg F

200 deg F an hour to 2310 deg F with a hold of 20 minutes at 2310 deg F

Down Fire Profile

A one hour hold at 1750 deg F

A three hour hold at 1700 deg F

A two hour hold at 1650 deg F

The cones on the shelf with this pot show cone 9 down, cone 10 tipped.

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

glaze compositions

Empirical Formula background glaze satIron_ZT_Mashiko_1E_0 :

K2O        .04
Na2O        .03
CaO        .19
MgO        .51
ZnO        .23

Al2O3        .6
Fe2O3        .24

SiO2        4.3
P2O5        .17

molecular percent Silica 68%

Empirical Formula inlay glaze nepheline_Z1A_1E_1 :

K2O        .10
Na2O        .68
CaO        .06
MgO        .16

Al2O3        .73
Fe2O3        .25

SiO2        4.1

molecular percent Silica 67%

background glaze satIron_ZT_Mashiko_1F_0 inlay nepheline_Z1A_1E_1

Close up Images of the interface

full view

full view

full view


full view

Full View of pot

bowl is ~ 8 inches in diameter





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