Also, Cone 10 can be any method. Oxidation, gas, reduction, salt or soda ... just a temp.
UR right Chris I did just assume that the 1027 was being fired oxidation and that the other potter needing cone10 would be used to a reduction atmosphere for their cone 10 work, hence the suggested test for glaze. I was under the impression that electric kilns really didn't handle anything but Oxidation very well and its rare for anyone to try???
I had no idea though that old bisque pieces would have issues related to sitting around for too long. Not meaning to hijack the thread, how long is too long?