Post's Jun Glaze
 |
 |
These tiles are from the bottom right corner of the Currie Grid. Glazes 34 and 35 have very low expansion numbers and might not fit my clays, so I decided to test glaze 33 which has an expansion coefficient of 70.9 x 10e-7 per degree C. Click to zoom in on the image above.
|
 |
|
 |
For this Jun grid glaze experiment I skipped making a flat tile and instead just dipped test tiles in each of the 35 cups. It sped things up in my studio on a day when the winter cold was creeping up my legs through the cement floor.
|
I was admiring the Jun glazes in Mike Bailey's Cone 6 glaze book and decided to create a Currie grid based on one of them.
The tile to the left is glaze number 33 from the grid experiment. Number 33 has no clay in the recipe, so using Glazchem software, I recalculated the recipe subbing in some Frit 3110 to replace some Kona F-4 feldspar. This allowed me to get 17% clay in the recipe and the resulting glaze on the right is nearly identical to the original in visual appearance.
The bowl is glazed with this new variation that I call Post's Jun. The clay body is an irony body and has specks of manganese dioxide in it. It was fired to cone 6. You can get a little better idea about how the glaze looks visually in the detail image or by clicking on the bowl to open a larger view of it.
