Vince Pitelka on wed 28 feb 07
Susan Hearn wrote:
> Does anyone know of a recipe for a mixture that acts like terra sig and
> can be fired to cone 5?
There is no such thing as a true terra sig that will retain its shine up to
cone 5. The nature of terra sig is that the shine is due to a compact
surface of platelets laying flat, and when you fire above lowfire
temperatures, the shrinkage in the clay causes the surface to buckle on a
microscopic level, and the shine is lost. It can still produce a nice silky
surface, but not a gloss. If you wish to try it, just make your sig from a
high-fire clay - EPK or Goldart or a ball clay.
You might find some useful information in my terra sig article at
Good luck -
Appalachian Center for Craft, Tennessee Technological University
Smithville TN 37166, 615/597-6801 x111
Susan Hearn on wed 28 feb 07
Does anyone know of a recipe for a mixture that acts like terra sig and can be fired to cone 5? Thsnks.