tonya Johnson on sun 25 nov 07
Ron,
Thanks so much for the reply. First, I do not use this glaze as a liner. I
use it as the design part and use a different glaze on the rest. However, I
will definitely try it without the zinc. I want it to be food safe. (And I'll
keep a lid on it! I have three cats and 4 dogs.) I just don't understand why
it would start doing this after so long. It makes me think it might be a
material change problem or a firing problem. When I remix a glaze, I re-sieve the
old batch and mix them together. I started getting some blisters. Then I
remixed entirely new and everything blistered. Some blisters were nearly a
quarter inch high...like warts! Maybe I will do a test: (1) pot with currently
mixed glaze (2) pot with new mix- same materials without zinc (3) pot with new
mix - new materials with zinc and (4) pot with new mix- new materials without
zinc-----Two sets of each, one set in my kiln and one set in a friends kiln.
That should tell me something. The thing about the kiln is that it has seemed
to change. I think I get too much back pressure through the peeps, too soon.
A lot of reduction. I did wiggle out my flue bricks to sweep out the
accumulated rust and slip them back in. I think in the same spot. I have a pipe stack
(MFT-with sprung arch added 5 yrs ago). I had to change my pipe after the
first 5 yrs and it has now been another 4 or so years. The pipe has a lot of
rust; maybe it has a hole? I read something about too much gas in the kiln could
cause blisters? I just don't know. But I am busy spreading the word that you
can save cone 9/10 pots with cone 6 glazes--I use your book : ) Thanks
again! Tonya Johnson
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