Lily Krakowski on mon 29 sep 03
Someone asked how to make cobalt blues kinder, gentler.
Derek Emms has a blue pigment which is 92 parts red clay, 4 parts Cobalt
carb or oxide, 4 parts MnO2. This is a wonderful mix as a slip, and I
expect a small amount in a glaze would produce a nice color.
Then there is Michael Cardew’s blue, from his book.
Cobalt 20
Manganese 10
Tin Ox. 20
Talc 10-15—the more talc, the grayer
Red Clay 15
Kaolin 20
Fe203 5
Montreal former potter Katherine Scott had this recipe
Fe203 25
Cobalt 15
Manganese 10
Chrome 5
Gerstley Borate 10
(I would use Frit 3124 here)
This gives a very pleasant mouse grey over porcelain. I expect it would be
as pretty over other clay.
I would suggest that whoever is looking to recapture an old glaze would mix
these in plenty of water, mix well, very well, let dry. Test in a glaze and
then go from there.
Please remember the complaint of older potters that today’s materials are
over refined; too pure. In try to replicate old glazes it is an idea to try
to ADD the stuff that refining or synthesizing takes out.
Lili Krakowski
Constableville, N.Y.
Be of good courage....
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