Lois Ruben Aronow on sun 4 oct 98
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On Sat, 3 Oct 1998 15:51:06 EDT, Marley Wolhud wrote:
=3E----------------------------Original message----------------------------
=3EOkay, I have been test firing constantly and have noticed something
=3E(although I am not sure of the reason). A few notes, I fire to cone 5
=3Eand 6 and always use distilled water and have tried about 30 glazes so
=3Efar (found through the archives and the list)
You bring up a good question. Does the water you use affect the
glaze? For instance, in the UK, the water is far heavier, and
contains more minerals than the water here in New York. Will using
different, distilled, or mineral water have an affect on the outcome
of the glaze?
Just wondering.
Louis Katz on mon 5 oct 98
The answer is yer. It is not that the hardness will have any effect on the
percentage composition of the fired glaze, but it will have an effect on the
way the glaze applies. The salts that make water hard can be Sodium Calcium
or other dalts and can deflocculate or flocculate the glaze slurry. I tell
my students "Application Application", this is what I want you to learn.
Glazes that contain less water apply in thicker coats faster. Less viscous
slurries run in application more.
Louis
Lois Ruben Aronow wrote:
> .....
> You bring up a good question. Does the water you use affect the
> glaze? For instance, in the UK, the water is far heavier, and
> contains more minerals than the water here in New York. ....
--
Louis Katz
lkatz@falcon.tamucc.edu
http://www2.tamucc.edu/lkatz/lkatz/
(512) 994-5987
Janet H Walker on mon 5 oct 98
...Does the water you use affect the glaze?
In my experience, it has a tremendous impact. I had a year of
frustration and disappointing test results before I went out to
the discount store and bought gallon jugs of distilled water.
I mix all my glazes and slips with distilled water. The results
are now much better. Also, they are consistent whether I mix
the glaze in town or at my studio, whether it is winter or summer,
and so on.
I'd say if you have moved and are having totally puzzling problems
with your previously successful glaze recipes, start over with a
set of tests using distilled water. Or the next most pure source
is probably rain water. Spring water is not "pure" in our sense
as it contains all kinds of minerals, which is what throws off
the glazes.
Cheers,
Jan Walker
Cambridge MA USA
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