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If
the piece is closed at the top as this one is, it will need to have a
vent hole. This allows heated expanding air to escape when the piece is
fired. A nostril hole is the perfect place for a vent hole in this
piece. (28)
Before placing the piece in the kiln, I’ll let it dry thoroughly, but
slowly. Sometimes I’ll loosely place a plastic bag or a piece of fabric
over it to allow it to dry evenly. Before firing, I will let my work
dry out in the kiln overnight with the kiln bottom element on low.
After working with clay for over 25 years I find that if a piece cracks
or pops in a kiln, it is due to the piece not being thoroughly dry as
opposed to having air pockets in the clay. My work is fired in a
standard Skutt electric kiln at cone 04 for about eight hours. Because
this work is so uneven in thickness, it is best to fire slowly. Work
should be allowed to cool slowly for the same reason.
This technique can be used to make much larger pieces. Right now, I am
limited by the size of my kiln. If you decide to make larger pieces, I
suggest using chopped nylon fibers to give strength to the clay slabs.
You can buy nylon fibers through a ceramic supply outlet or you can just
go buy nylon rope, fray it and cut it into 1/2” lengths. |