I am experimenting w/ various techniques of clay firing for stonewares. I tend to not use any glazes as I am interested in the final work having a texture & feel of old clay vessels. I read somewhere that after a period of low firing, one can cover the surface of the piece w/ fire-resistant clay and then do high firing for a longer period. This method prevents any ash glaze from the direct fire. Does anyone know more about this method? Also, where would one find fire-resistant clay for such a method? Any advice is appreciated!