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.
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
|Kaolin Sedlec Ia||33|
Clay tested: cca 1/2 M11 salt-Wittgert / 1/2 Stoneware-St.Amand
Gail Nichols Rutile
Nepheline Syenite 10
Note: Slip applied in different thicknes
Clay tested: Polar VV – from H+K Lubná (http://www.kerlubna.cz/)
Note: Slip applied quit thick
Clay tested: 1/2 shamot clay for shiedel chimney (the inside tube) / 1/2 Polar VV – from H+K Lubná (http://www.kerlubna.cz/)
Results: Slip applied quit thick