bill edwards on wed 14 sep 05
I went back and looked at Louis Katz information on
water and asked him for current analysis. Then I
researched other Cities for sodium content in water. I
was thinking when I read what Ron wrote that the
impression was trace elements such as those that ride
in with what we buy all over the globe not the salts,
that would have been too common for me to have thought
of. (Sorry, my brain works differently because of my
experiences) No two are hardly ever identical (not our
brains, the water samples) when analyzed in a lab if
you are looking to extract trace elements or secondary
contaminates instead of primary concerns.
Asbestos, chlorides, silica, sodium etc, are only part
of the water quality, or lack of quality sometimes
found out there. City to City has different shifts in
these qualities. What I did find was the high sodium
content that some of the water samples had in them. In
the several states I lived and under various water
controls, I have never personally experienced this
problem with water alone. I am not saying it's not
happening. I am looking to make myself aware and
accept being wrong as I merge this information in with
other information I have.
Clays with barium usually can remove this problem from
the clay if scumming is the problem. My understanding
is this isn't the practice as of late? (Ron, is this
still a practice?)
Read what Louis wrote and remember what Ron said and
put all this together and exercise with it. That's
exactly what I did because I never had the experience
with that particular problem and it is good for me to
see it up close to prevent it from being a future
I credit Louis for his research, Ron for his imput and
respect them highly. I have always said we have the
best team of people available here at any given moment
to hash out the worst problems and bring them to
light, and we do! Never would I reject the notion that
others wouldn't have better experiences than I. But I
will question how they got their answers and learn
from them by doing so.
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Ron Roy on mon 19 sep 05
Yes - it is still the only way I know of to tie up soluble salts in clay
bodies. The Barium Carb. combines with the solubles and makes them
insoluble and they therefore stay where they are during the drying process.
The trick is to use only a much as it necessary and thereby "using up" the
soluble barium carb.
It's only necessary with dark clays - as the solubles that come to the
surface (called scumming) are not noticable with white clays.
Solubles in clay can be a problem with white clays as well if there is
enough. The salts will flux the clay more where they end up on the dry ware
- rims on cups dried upright can wind up harder after bisque firing and
will not take as much glaze for instance.
>Clays with barium usually can remove this problem from
>the clay if scumming is the problem. My understanding
>is this isn't the practice as of late? (Ron, is this
>still a practice?)
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