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triple firing?

updated sun 4 nov 01


Bonnie Thompson on tue 30 oct 01

I have just started using Axner's Overglaze Pens on previously glazed
stoneware fired to cone 6. After decorating I fire again to cone 05.
I have found the pens' glaze to retain their high profile on the pot,
which I had wondered about. I also had another surprise. I expected
no change in the color of the original glaze that matured at cone 6.
I found the glaze became somewhat duller--looking sort of older in
the case of a gerstley borate coral--and more transparent with a
gerstley borate pale grey. Has anyone had any other experiences with
this process? This triple firing all started with my pursuit of
redder reds at stoneware temperatures. I refired a pot originally
glzed with Persimmon, a cone 6 glaze that produces a reddish brown
glaze, and when fired again to cone 06 it produced a more brilliant

Bonnie Thompson
on a beautiful fall day in New Hampshire,
where the oak leaves are turning deep red brown, too

Manager, UNH Computer Store
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Durham NH 03824

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Snail Scott on tue 30 oct 01

At 03:17 PM 10/30/01 -0500, Bonnie wrote:
>... expected
>no change in the color of the original glaze that matured at cone 6.
> Has anyone had any other experiences with
>this process?...

Refiring stoneware glazes at lower temperatures often
replicates the effect of a much longer cooling cycle
in the original firing. This is especially pronounced
with matte glazes, especially if the original firing
was cooled too quickly. (This happens often in electric
kilns if they are shut off by the kiln sitter.)


Nanci Bishof on sat 3 nov 01

Lana Wilson uses that technique to enhance color development. I've used it on
pieces with good results. Makes for a more interesting glaze.