Dan Wilson on mon 30 sep 96
Bob I've noticed this is also true when I brush cone 9 glazes. There must
be a difference in the density of the glaze when it is applied with a
brush. A glaze, when it is dipped or poured, becomes attatched to the body
of the pot as a random un - compressed matrix. Its adherence to the surface
of the body is tenuous, especialy at the interface of glaze and clay body.
This is not true with brushing, as the glaze particles are actively
attatched to the surface of the clay and become aligned and compressed with
each stroke. Creating a more dense matrix, less succeptable to pinholing.
dan
Bob Kavanagh on wed 2 oct 96
Good morning Dan
Thanks for your note. I had wondered about compression and the way the
particles might lie. I envisioned two options: either a tight compression
and compact laying down of particles inhibits the passing of gases, or
because the glaze is well aligned, it heals easily after gases pass
through. Both would suggest no bubble problem. My inclination is to think
gases do not pass through but then I don't know what happens to them.
There was no bloating and the fired clay appeared normal in other respects.
If you see something similar at high temp then one would assume gases do in
fact pass through.
Have a good day.
bob
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