Tests, which call for further explorations and experiments

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As we have tested many local materials (clays from all over Europe, brought by the participants) we have learned quit a lot about their look in soda firing. We have also seen the wide possibilities, which surely will lead to more experiments.

In my case the experiment will start immediately after building new wood kiln with the chamber for soda firing as the one I have right now is not suitable for soda firing (it is soft brick and need to last another year for our woodfiring).

For now I can share the results from the firing in La Meridiana:

All pots fired in gas kiln, reduction, approximatly to Seger cone 8-10 (1250 – 1300°C), soda introduced after cone 8 partly down.

TEST 1

Clay tested: Polar VV – from  H+K Lubná (http://www.kerlubna.cz/) – first picture show the clay not fired and second show this clay fired in woodkiln to 1250°C

Slip tested:

Nepheline Syenite 33
Kaolin Sedlec Ia 33
Silica 33
Fe2O3 1,5
TiO2 13,5

Results:

TEST 2

Clay tested: cca 1/2 M11 salt-Wittgert / 1/2 Stoneware-St.Amand

Slip tested:

Gail Nichols Rutile

Caolin                  80

Nepheline Syenite         10

Quarz                               10

Bentonite                          3

Rutile                                 3

Borax                                 3

Note: Slip applied in different thicknes

Results:

TEST 3

Clay tested: Polar VV – from  H+K Lubná (http://www.kerlubna.cz/)

Slip tested:

Kaolin 40
Witgert 40
Borax 5
Ultrox 10

Note: Slip applied quit thick

Results:

TEST 3

Clay tested: 1/2 shamot clay for shiedel chimney (the inside tube)  / 1/2 Polar VV – from  H+K Lubná (http://www.kerlubna.cz/)

Slip tested:

Kaolin 40
Witgert 40
Borax 5
Ultrox 10

Results: Slip applied quit thick

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