Tuesday, February 01, 2011
Portfolio Photography Cassius Basaltic Clay 7
Here is a small bowl I did out of the Cassius Basaltic Clay.
The liner glaze is a PB (Plastic Bitrox) Liner. This glaze works very well with this clay because the PB Liner is able to be fired with a range of cone 4 to cone 14. So if the cassius Basaltic clay still has gasses to be released, even after a longer bisque period, the PB Liner stays in a liquid / molten state for a longer time, giving the gasses from the clay time to escape without creating cratering in the glazing.
The PB Liner recipe with Percentage by Weight:
Plastic Bitrox 50%
To fill a 5 gallon bucket only 3 quarters full you would use
Colemanite 3000 grams
Plastic Bitrox 3000 grams
Zircopax 600 grams