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I have started this year in Egypt with an old kiln that was made digital
over the summer. I test fired glaze test tiles successfully at 1100
Then I fired my 8th grade ceramic tile mural at the same temperature, and
only 1/3 of the tiles survived. The rest of the tiles broke into bits as
small as sand to as big as a quarter. I am not sure what happend, but I
am terrified to fire my high school pieces until I figure it out.
Do you think that it is from impurities in the clay? It was bought on the
local Egyptian market. It has little bits of plaster and some other type
of rock in it that the students picked out carefully while wedging and
incising their pieces.
Or did I fire at the wrong temperature?
Any suggestions would be terrific. I want to make sure it is the clay
before I through the rest of the barrel out.
Lisa Teske, art teacher
Schutz American School * P.O. Box 1000 * Alexandria, Egypt 21111
lisa * http://welcome.to/theteskes