F. Melville on wed 10 sep 97
I use Laura's Clear cone 6 glaze on single-fired cone 6 stoneware
(Navajo Wheel). I fire in an updraft Olympic gas kiln (oxidation) and the
first time I tried it, there was slight delayed crazing on one piece. I
subsequently added less than 2% silica and have had no more problems.
Because of its high clay content, I find this transparent glaze very
suitable for single-firing and there is no cloudy effect when it is used on
red clay. Gerstley Borate has always worked well for me in single-fire
glazes. However, I have never tried it on bisque because I never bisque.
From what I understood from the original question, Sande was having crazing
problems when using this glaze on cone 10 stoneware and porcelain bodies
fired to cone 6, which I think might be causing a poor fit. Why not use a
clay that matures at cone 6, especially if the ware is functional and
porosity is not desirable?
Francoise
F. Melville
Indalo Pottery
P.O. Box 95
Port Edward, B.C.
V0V 1G0
Canada
Email:fmelvill@mail.kaien.com
http://members.tripod.com/~indalopottery
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