Larry, when this happened to me, I think it was because my bottoms still must
have had some water in them. ( Not dry enough.) It has only happened on this
one load that I was in a hurry to fire.
Larry Seiler wrote:
> opened my kiln, and all three of my wheel thrown pieces with the white
> midfire clay had their bottoms blown out. All other projects were of
> the Mid Range Oxidation (red earthenware) and no problems. Fired at
> 08... One larger piece disintegrated entirely.
> Wondering if because there is less grog/grit in white clay, if it is
> that much more pertinent to bisque fire at slowest speeds? I fired at
> Medium speed, to about 1700 degrees. The white clay was all new out of
> the bag, and wedged well....
> Larry S...