My kiln goes to cone 6! It's an old kiln that I got as a hand-me-down and I've never actually tried to fire it this high. Cone 6 is about 2232 degrees Fahrenheit or 2269 if you fire faster. I don't have pyrometer at home, so I'm not sure how fast I fired the kiln.
|cone 6 glaze tests with underglaze and several different glazes|
I usually fire my home kiln to cone 04 which is just 1945 -1972 degrees Fahrenheit. The lower temperature requires glazes with a lower melting point and even clay with a lower vitrification point.
cone 04 glaze on the left, cone 6 glaze (fired at Archie Bray) on the right
For the Archie Bray workshop I attended earlier this summer, we used cone 6 clay and cone 6 glazes. Now I have quite a few bisqued bowls and cups made with this clay. If I were to fire the cone 6 bowls with cone 04 glazes, the bowls would be likely to leak because the clay body would still be porous.
So, I purchased some cone 6 glazes with the idea that I can fire these pieces to a higher temperature and, at the same time, experiment with some more glazes. I keep seeing semi-transparent celadon glazes used by nationally recognized artists, including those at the the Archie Bray, and even local artists (Bernadette Trabue Crider has carved celadon pottery at Oak Hollow Gallery in August).
|my cone 6 glaze options|
|not a very full kiln|
|the cone in the sitter after firing|
Happily, the firing went well, the cone melted in the sitter and the glaze tests came out just fine, everything melted well and the colors were basically good. Now it's time to get down to work and really glaze the remaining work. I have about one kiln load of low fire work (cone 04 clay) and about two kiln loads of cone 6 work. I have begun glazing the low temperature work, but not the high temperature work.
cone 6 bisqueware on the left, the mess that is my glazing process on the right