Marcia Kindlmann on tue 26 nov 96
Subject: bisque effect on glaze?
Hi Richard,
You note that
> Bisque firing to the cone 05 or above range will greatly aid removal of
> sulfur compounds. Many of these compounds do not burn out completely at
> cone 07-06 or lower bisque temperatures. Care must be taken not to bisque
>too high so as to make the ware too dense and glazing difficult.
To avoid the too-dense bisque, would it be possible to simply go slowly enough
in the glaze firing to burn out the sulfur compounds, say from cone 07 through
05, after a cone 07 bisque? At what temperature do cone 9 or cone 10
stoneware glazes begin to sinter? I'm thinking that if the glaze is still
porous, the sulfur compounds could pass through the glaze coating. What do
you think?
Also, how many degrees per hour should one fire at, to go slowly enough
to burn out sulfur?
Thanks,
Marcia in Guilford CT
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