Edouard Bastarache on sun 15 apr 12
Leaving Bariumville: Replacing Barium Carbonate in Cone 10 Glazes in
by Daniel Semler in=3D20
http://ceramicartsdaily.org/ceramic-glaze-recipes/glaze-chemistry-ceramic=
=3D
-glaze-recipes-2/leaving-bariumville-replacing-barium-carbonate-in-cone-1=
=3D
0-glazes/
Plejkore,
Edouard Bastarache=3D20
Spertesperantisto=3D20
Sorel-Tracy
Quebec
http://www.flickr.com/photos/30058682@N00/
http://edouardbastarache.blogspot.com/
http://smart2000.pagesperso-orange.fr/bloggs_edouard.htm
http://www.facebook.com/edouard.bastarache
Randall Moody on sun 15 apr 12
The estimated fatal dose of barium carbonate is about 5 grams for a 70kg
(154 lbs.) human. I seriously bought that you would get 5 full grams of
barium leaching out of the glaze on your coffee cup.
I am a proponent of safety but not of Chicken Little "The sky is falling!"
tossing the baby out with the bathwater nonsense.
On Sun, Apr 15, 2012 at 7:50 PM, Edouard Bastarache wro=
te:
> Leaving Bariumville: Replacing Barium Carbonate in Cone 10 Glazes in
> by Daniel Semler in
>
>
> http://ceramicartsdaily.org/ceramic-glaze-recipes/glaze-chemistry-ceramic=
-glaze-recipes-2/leaving-bariumville-replacing-barium-carbonate-in-cone-10-=
glazes/
>
> Plejkore,
>
> Edouard Bastarache
> Spertesperantisto
>
> Sorel-Tracy
> Quebec
>
> http://www.flickr.com/photos/30058682@N00/
> http://edouardbastarache.blogspot.com/
> http://smart2000.pagesperso-orange.fr/bloggs_edouard.htm
> http://www.facebook.com/edouard.bastarache
>
--
Randall in Atlanta
http://wrandallmoody.com
James Freeman on tue 17 apr 12
Barium compounds are widely used in many products, and our use in studio
glazes is but a tiny drop in the ocean. Here are a few of the products
which either contain barium or employ barium in their manufacture:
Plastics
Rubber
Resins
Motor oil
Polyurethane foam
Leather tanning
Paper
Soap
Dry cell batteries
Fireworks
Fabric and paper dyes and mordants
Oil and gas drilling fluid
Glass
Commercial ceramic glazes
Brick manufacture
Neon signs
Linoleum
Bleaches
Depilatory creams
Water softening
Oil and grease
Photographic paper
Matches
Copper
Inks
Paints
Cosmetics
Drug tablets
45% of all barium carbonate is used in the manufacture of glass (you may be
drinking out of it right now!). 25% of all barium carbonate is used in the
manufacture of bricks.
Barium is naturally occurring in 99.4% of all surface water, and is not an
environmental problem even downstream of major manufacturing operations
which employ it. This, from the EPA:
Barium is found in waste streams from a large number of manufacturing
plants in quantities that seldom exceed the normal levels found in soil.
Background levels for soil range from 100-3000 ppm barium. Occurs naturally
in almost all (99.4%) surface waters examined, in concentration of 2 to 340
ug/l, with an average of 43 ug/l. The drainage basins with low mean
concentration of barium (15 ug/l) occur in the western Great Lakes, & the
highest mean concentration of 90 ug/l is in the southwestern drainage
basins of the lower Mississippi Valley. In stream water & most groundwater,
only traces of the element are present.
In water, the toxic barium salts (which we do not use) are quickly
converted to the insoluble and far less toxic carbonate and sulphate forms
(we use the carbonate form). This, from the EPA:
In water, the more toxic soluble barium salts are likely to precipitate out
as the less toxic insoluble sulfate or carbonate. Barium is not very mobile
in most soil systems. Adsorption of barium was measured in a sandy soil and
a sandy loam soil at levels closely corresponding to those to be expected
for field conditions.
Here is a link to the entire EPA report on barium, if you wish to peruse
it: http://www.epa.gov/ogwdw/pdfs/factsheets/ioc/tech/barium.pdf
We keep trying to make barium carbonate out to be an evil bugaboo, but the
facts do not support our fears.
For the sake of full disclosure, Albert Jay Nock does not like barium, but
Bono does!
All the best.
...James
James Freeman
"Talk sense to a fool, and he calls you foolish."
-Euripides
http://www.jamesfreemanstudio.com
http://www.flickr.com/photos/jamesfreemanstudio/
http://www.jamesfreemanstudio.com/resources
jonathan byler on tue 17 apr 12
our problems with barium have more to do with EPA rules and water
quality down stream from us. fish and other animals need a much
smaller dose than us for it to be harmful to them. just because it
isn't killing you directly, doesn't mean that your chemicals don't
have an effect on others.
be sensible, find better ways when possible, use your materials
responsibly. again just because you don't see an effect right now in
real time, does not mean that there are not problems associated with
some of your materials, especially disposal of said materials. most
times the scientists are right, and unfortunately the government
regulators all too lax in what they allow businesses and individuals
to spew into the environment unchecked. yes it all came from the
environment in the first place, but often where it was before we got
to it, the hazardous materials were sequestered in ways that didn't
directly pollute our water supplies and the air we breath. be
careful, in terms of environmental degradation, its harder to fix than
to not break things in the first place.
On Apr 15, 2012, at 8:45 PM, Randall Moody wrote:
> The estimated fatal dose of barium carbonate is about 5 grams for a
> 70kg
> (154 lbs.) human. I seriously bought that you would get 5 full grams
> of
> barium leaching out of the glaze on your coffee cup.
>
> I am a proponent of safety but not of Chicken Little "The sky is
> falling!"
> tossing the baby out with the bathwater nonsense.
>
>
> On Sun, Apr 15, 2012 at 7:50 PM, Edouard Bastarache > >wrote:
>
>> Leaving Bariumville: Replacing Barium Carbonate in Cone 10 Glazes in
>> by Daniel Semler in
>>
>>
>> http://ceramicartsdaily.org/ceramic-glaze-recipes/glaze-chemistry-cerami=
c-glaze-recipes-2/leaving-bariumville-replacing-barium-carbonate-in-cone-10=
-glazes/
>>
>> Plejkore,
>>
>> Edouard Bastarache
>> Spertesperantisto
>>
>> Sorel-Tracy
>> Quebec
>>
>> http://www.flickr.com/photos/30058682@N00/
>> http://edouardbastarache.blogspot.com/
>> http://smart2000.pagesperso-orange.fr/bloggs_edouard.htm
>> http://www.facebook.com/edouard.bastarache
>>
>
>
>
> --
> Randall in Atlanta
> http://wrandallmoody.com
ronroy@CA.INTER.NET on wed 18 apr 12
Hi Jonathan,
And - in most glazes - like white and copper red glazes - completely
unnecessary. Why use an expensive material when plain old whiting will
do the job just fine and help solve crazing as well.
Those glazes with 30 to 40% of barium that give such a beautiful
surfaces and colour response from copper an cobalt are very poor
choices for a liner glaze anyway.
Anyone with a glaze with under 15% barium can be altered to look just
the same when the proper amount of whiting subbed in. I'll be happy to
do it for anyone who wants to try it.
RR
Quoting jonathan byler :
> our problems with barium have more to do with EPA rules and water
> quality down stream from us. fish and other animals need a much
> smaller dose than us for it to be harmful to them. just because it
> isn't killing you directly, doesn't mean that your chemicals don't
> have an effect on others.
>
> be sensible, find better ways when possible, use your materials
> responsibly. again just because you don't see an effect right now in
> real time, does not mean that there are not problems associated with
> some of your materials, especially disposal of said materials. most
> times the scientists are right, and unfortunately the government
> regulators all too lax in what they allow businesses and individuals
> to spew into the environment unchecked. yes it all came from the
> environment in the first place, but often where it was before we got
> to it, the hazardous materials were sequestered in ways that didn't
> directly pollute our water supplies and the air we breath. be
> careful, in terms of environmental degradation, its harder to fix than
> to not break things in the first place.
>
>
> On Apr 15, 2012, at 8:45 PM, Randall Moody wrote:
>
>> The estimated fatal dose of barium carbonate is about 5 grams for a
>> 70kg
>> (154 lbs.) human. I seriously bought that you would get 5 full grams
>> of
>> barium leaching out of the glaze on your coffee cup.
>>
>> I am a proponent of safety but not of Chicken Little "The sky is
>> falling!"
>> tossing the baby out with the bathwater nonsense.
>>
>>
>> On Sun, Apr 15, 2012 at 7:50 PM, Edouard Bastarache >>> wrote:
>>
>>> Leaving Bariumville: Replacing Barium Carbonate in Cone 10 Glazes in
>>> by Daniel Semler in
>>>
>>>
>>> http://ceramicartsdaily.org/ceramic-glaze-recipes/glaze-chemistry-ceram=
ic-glaze-recipes-2/leaving-bariumville-replacing-barium-carbonate-in-cone-1=
0-glazes/
>>>
>>> Plejkore,
>>>
>>> Edouard Bastarache
>>> Spertesperantisto
>>>
>>> Sorel-Tracy
>>> Quebec
>>>
>>> http://www.flickr.com/photos/30058682@N00/
>>> http://edouardbastarache.blogspot.com/
>>> http://smart2000.pagesperso-orange.fr/bloggs_edouard.htm
>>> http://www.facebook.com/edouard.bastarache
>>>
>>
>>
>>
>> --
>> Randall in Atlanta
>> http://wrandallmoody.com
>
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