Steve Slatin on thu 10 jan 08
Edouard --
A worthy pursuit -- I know very
little about low-fire glazes,
as I don't fire lower than ^5.
I asked about the acid
test because sometimes it
reveals instability in a
glaze. Like the freezer-to-
boiling-water test, it
simulates many cycles of
wear. When you do the
home version of the acid
test, you don't know what
specifically is leaching --
but if there's leaching,
you can anticipate a high
probability of surface
deterioration over time.
Best wishes, and please
tell your wife that I
think she has excellent
taste -- Steve S
"Edouard Bastarache Inc." wrote:
Hello Steve,
sorry I have only found your post right now in the archives,
I have never recieved it in the usual manner.
"Edouard -- It's a beauty. Does it pass the acid test?
Steve"
Since I am not afraid of my own shadow and since
lithium is not regulated, it was not tested for
lithiun release.
This glaze is the result of experimenting glazes for
a welder on welfare who needed help and
was heating his home and small studio with hardwood.
He was firing C/04.
So, we decided to put high amounts of 200-mesh sieved
washed hardwood ash knowing that at C/04 it was rather
refractory, then I told Bernard we will have to melt the ash
that at higher temperature is a flux, often times replacing
whiting. Probably the excess calcium gives hardness to this
glaze like it does for bones
Therefore we used lithium carbonate, among other stuffs.
to achieve our goals, make a glaze, save money to a poor
low-fire potter and recycle a waste material.
All of "gratos" for a potter in trouble.
With him I tested close to 1600 C/04 glazes, often times
colouring them with industrial waste materials.
Oh, before I leave, my wife does not want me to sell it.
Steve Slatin --
History teaches us that there have been but few infringements of personal liberty by the state which have not been justified ...
in the name of righteousness and the public good, and few which
have not been directed ... at politically helpless minorities.
-- Harlan Fiske Stone
---------------------------------
Looking for last minute shopping deals? Find them fast with Yahoo! Search.
Edouard Bastarache Inc. on thu 10 jan 08
Hello Steve,
sorry I have only found your post right now in the archives,
I have never recieved it in the usual manner.
"Edouard -- It's a beauty. Does it pass the acid test?=20
Steve"
Since I am not afraid of my own shadow and since=20
lithium is not regulated, it was not tested for=20
lithiun release.
This glaze is the result of experimenting glazes for=20
a welder on welfare who needed help and
was heating his home and small studio with hardwood.
He was firing C/04.
So, we decided to put high amounts of 200-mesh sieved=20
washed hardwood ash knowing that at C/04 it was rather=20
refractory, then I told Bernard we will have to melt the ash
that at higher temperature is a flux, often times replacing
whiting. Probably the excess calcium gives hardness to this=20
glaze like it does for bones
Therefore we used lithium carbonate, among other stuffs.
to achieve our goals, make a glaze, save money to a poor=20
low-fire potter and recycle a waste material.
All of "gratos" for a potter in trouble.
With him I tested close to 1600 C/04 glazes, often times
colouring them with industrial waste materials.
Oh, before I leave, my wife does not want me to sell it.
http://photos1.blogger.com/blogger/2809/1218/1600/BXId.jpg
"In awe -- Steve Slatin"
Thank you=20
Gis la revido,
(A la revoyure)
Edouard Bastarache=20
Spertesperantisto
Sorel-Tracy
Quebec
http://www.flickr.com/photos/30058682@N00/
http://www.flickr.com/photos/potier/20321056/
http://perso.orange.fr/smart2000/livres.htm
http://www.pshcanada.com/Toxicology.htm
http://myblogsmesblogs.blogspot.com/
Lee Love on fri 11 jan 08
On 1/11/08, Edouard Bastarache Inc. wrote:
>
> Since I am not afraid of my own shadow and since
> lithium is not regulated, it was not tested for
> lithiun release.
Hahah! Knowledge keeps fear from controlling us.
> http://photos1.blogger.com/blogger/2809/1218/1600/BXId.jpg
That's a beauty! I dug an old birdbath out of our unpacked
storage and had it outside with water all summer. Only problem was
that algae like to grow on the shino glaze. I have been thinking, a
copper green that won't pass the "acid test" might be the way to go.
The copper might keep the algae bloom down.
--
Lee in Mashiko, Japan
http://groups.google.com/group/ClayCraft
"Men are born ignorant, not stupid. They are made stupid by
education." -- Bertrand Russell
Edouard Bastarache Inc. on fri 11 jan 08
Lee,
that is typical french expression in Quebec :
"Je n'ai pas peur de mon ombrage"
Gis la revido,
(A la revoyure)
Edouard Bastarache
Spertesperantisto
Sorel-Tracy
Quebec
http://www.flickr.com/photos/30058682@N00/
http://www.flickr.com/photos/potier/20321056/
http://perso.orange.fr/smart2000/livres.htm
http://www.pshcanada.com/Toxicology.htm
http://myblogsmesblogs.blogspot.com/
----- Original Message -----
From: "Lee Love"
To:
Sent: Friday, January 11, 2008 9:57 AM
Subject: Re: Re ; Lithium
> On 1/11/08, Edouard Bastarache Inc.
> wrote:
>
>>
>> Since I am not afraid of my own shadow and
>> since
>> lithium is not regulated, it was not tested for
>> lithiun release.
>
> Hahah! Knowledge keeps fear from
> controlling us.
>
>> http://photos1.blogger.com/blogger/2809/1218/1600/BXId.jpg
>
> That's a beauty! I dug an old birdbath
> out of our unpacked
> storage and had it outside with water all
> summer. Only problem was
> that algae like to grow on the shino glaze. I
> have been thinking, a
> copper green that won't pass the "acid test"
> might be the way to go.
> The copper might keep the algae bloom down.
>
> --
> Lee in Mashiko, Japan
> http://groups.google.com/group/ClayCraft
>
> "Men are born ignorant, not stupid. They are
> made stupid by
> education." -- Bertrand Russell
>
> ______________________________________________________________________________
> Clayart members may send postings to:
> clayart@lsv.ceramics.org
>
> You may look at the archives for the list, post
> messages, or change your
> subscription settings here:
> http://www.acers.org/cic/clayart/
>
> Moderator of the list is Mel Jacobson who may be
> reached at melpots2@visi.com
>
>
>
> --
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.5.516 / Virus Database:
> 269.19.0/1218 - Release Date: 2008-01-10 13:32
>
>
Lee Love on sat 12 jan 08
On 1/12/08, Edouard Bastarache Inc. wrote:
> Lee,
>
> that is typical french expression in Quebec :
> "Je n'ai pas peur de mon ombrage"
It is prettier in French! You never flog your credentials, or
your books, so I will here.
from:
http://www.pshcanada.com/Toxicology.htm
Toxicology Ceramics, Glass & Metallurgy
About the Author: Edouard Bastarache lives in Qu=E9bec, Canada, and has
a colorful history. He studied surgery, internal medicine and
neuroendecrine physiology and was a medical researcher and consultant
in Occupational & Environmental Medicine between 1971 and 1983. Since
1983 he has been a full-time consultant in occupational and
environmental medicine. At the same time as his medical studies, he
studied ceramics under Julien Cloutier at La Boutique d'Argile (The
Clay Shop) and later also taught at the same school. Bastarache now
lives in the Sorel-Tracy region of Qu=E9bec, near the St. Lawrence
river. He uses waste materials from steel plants located in the area
to color many of his glazes and clays. He fires most of his work to
cone 9 1/2 in reduction in a 60 cubic foot downdraft gas kiln. His
first book, "Substitutions for Raw Ceramic Materials" is available in
8 languages: French, English, German, Italian, Spanish, Portuguese
(Portugal & Brazil), and Esperanto.
--=20
Lee in Mashiko, Japan
http://groups.google.com/group/ClayCraft
"Men are born ignorant, not stupid. They are made stupid by
education." -- Bertrand Russell
MT Hannigan on sun 13 jan 08
Sorry, I haven't been following the thread of this, just the part
about copper in birdbaths.
This info on copper toxicity is from the now-defunct National
Birdfeeding Society. I think they were talking about actual copper
metal birdbaths, not copper-glaze birdbaths, but I'm not sure. Also,
some metals, like iron, make water taste bad to birds and they won't
drink it.
Q: Is copper toxic to birds?
A: As long as you put only water in the copper birdbath, there
should be no problems. Toxicity could occur only if the copper finish
got flaked off by using vinegar or some other abrasive to clean the
bath. There are several water resources listed on the National Bird-
Feeding Society's web site (http://www.birdfeeding.org) from which
you might get more detailed information.
This info on copper toxicity is from the EPA's website:
Copper
Copper is a micronutrient and toxin. It strongly adsorbs to organic
matter, carbonates and clay, which reduces its bioavailability.
Copper is highly toxic in aquatic environments and has effects in
fish, invertebrates, and amphibians, with all three groups equally
sensitive to chronic toxicity (USEPA 1993; Horne and Dunson 1995).
Copper is highly toxic to amphibians (including mortality and sodium
loss), with adverse effects in tadpoles and embryos (Horne and Dunson
1995; Owen 1981). Copper will bioconcentrate in many different organs
in fish and mollusks (Owen 1981). There is low potential for
bioconcentration in fish, but high potential in mollusks. Copper
sulfate and other copper compounds are effective algaecides (free
copper ions are the lethal agent). Single-cell and filamentous algae
and cyanobacteria are particularly susceptible to the acute effects,
which include reductions in photosynthesis and growth, loss of
photosynthetic pigments, disruption of potassium regulation, and
mortality. Sensitive algae may be affected by free copper at low
(parts per billion) ppb concentrations in freshwater.
There is a moderate potential for bioaccumulation in plants and no
biomagnification.Toxic effects in birds include reduced growth rates,
lowered egg production, and developmental abnormalities. While
mammals are not as sensitive to copper toxicity as aquatic organisms,
toxicity in mammals includes a wide range of animals and effects such
as liver cirrhosis, necrosis in kidneys and the brain,
gastrointestinal distress, lesions, low blood pressure, and fetal
mortality. (ATSDR 1990c; Kabata-Pendias and Pendias 1992; Ware 1983;
Vymazal 1995)
On Jan 13, 2008, at 5:05 PM, Lee Love wrote:
> On 1/14/08, Ron Roy wrote:
>
>> I see birds drinking from our bird baths - I wonder how
>> much dissolved copper birds can handle before they are affected?
>
> Because of pesticide and fertilizer leaching copper out of our
> soil, we are all facing copper deficiencies. Factory raised food
> does not have the dietary copper in it we require for a healthy
> nervous system. As we know with the Bald eagle, these pesticides
> also effect wildlife. These copper deficiencies may be implicated in
> neurological diseases BSE and Alzheimer's
>
> In the study I provided earlier, which examined sickness
> caused by drinking water, because folks in India switching from
> traditional copper and brass water containers to plastic, the amount
> needed to keep bacteria from forming, causes less than the daily
> requirement of copper in the human diet. *I provide the article from
> the archives below.
>
> If we can look at this topic rationally, we can make good use
> of our materials for different purposes:
>
> As Edouard has said: "Je n'ai pas peur de mon ombrage"
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> *
> /"/*The amounts that circulate into the brass water vessels would not
> harm humans, Reed adds. According to the researchers, even a person
> drinking 10 litres of such water in a single day would take in less
> than
> the daily recommended dose of copper or zinc.*/ "
>
> from Nature.com
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> /*Drinking water stored in brass vessels good for health
>
> Brass jugs polish off disease
> Roxanne Khamsi
> Traditional pitchers beat plastic in safe water stakes.
>
> Brass water containers could combat many water-borne diseases,
> according
> to microbiologists. The discovery suggests that these vessels
> should be
> used in developing countries, where people typically view cheaper
> plastic containers as the better option.
>
> Water-borne diseases remain a serious threat in many poor regions
> of the
> world, with around 2 million children dying each year from diarrhoea.
> Efforts to provide safe drinking water have had difficulty reaching
> remote areas.
>
> Even in places with basic water-purification systems, people often opt
> for riskier wells under trees because the water is cooler, says Rob
> Reed, who led the brass study. On a recent trip to India, Reed, a
> microbiologist at Northumbria University in Newcastle upon Tyne, UK,
> witnessed villagers doing exactly this.
>
> But he also heard an interesting piece of local wisdom: people believe
> that traditional brass water containers offer some protection against
> sickness. The idea intrigued Reed, who was in Asia investigating the
> antibacterial effects of sunlight on water.
>
> He has now found that bacteria are indeed less likely to thrive in
> brass
> water pots than in earthenware or plastic ones. "It's one of the
> traditional ideas of water treatment and we were able to find a
> microbiological basis for it," he says...
>
> ...Plastic beliefs
>
> Brass water pots also easily outperformed plastic ones, the
> researchers
> discovered. Plastic, says Reed, did not inactivate the bacteria. But
> many people in developing nations use plastic drinking vessels,
> because
> they view them as more modern...
>
> ...Although Reed declines to speculate about exactly how many lives
> could be saved by switching to brass, he points to the millions of
> lives
> claimed each year by water-borne diseases. Storing water in brass for
> two days could stop this, he suggests: "The potential is great."
> *
>
> --
> Lee in Mashiko, Japan
> http://groups.google.com/group/ClayCraft
>
> "Men are born ignorant, not stupid. They are made stupid by
> education." -- Bertrand Russell
>
> ______________________________________________________________________
> ________
> Clayart members may send postings to: clayart@lsv.ceramics.org
>
> You may look at the archives for the list, post messages, or change
> your
> subscription settings here: http://www.acers.org/cic/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
> melpots2@visi.com
Ron Roy on sun 13 jan 08
Copper as biocide - I see birds drinking from our bird baths - I wonder how
much dissolved copper birds can handle before they are affected?
I remember someone on this list saying they killed a bunch of fish with
barium glazed aquarium sculptures.
RR
> I dug an old birdbath out of our unpacked
>storage and had it outside with water all summer. Only problem was
>that algae like to grow on the shino glaze. I have been thinking, a
>copper green that won't pass the "acid test" might be the way to go.
>The copper might keep the algae bloom down.
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
steve graber on sun 13 jan 08
i missed alot of this thread, but can relate something of the Spa industry i worked in for a few years.
silver threads are added to spa filters to inhibit germs from growing on the filters. copper being in the same family on the periodic table also does have this affect, though not as well as silver.
it only keeps germs from growing ON the silver threads. not in the general proximity. admittedly the spa industry uses this "germ free" characteristic of silver as a sales pitch and can not rely on silver really doing much to the spa water quality.
i doubt the birds get anything hazardous from a copper bath, much less silver. they also though may very well enjoy that bug zone of algea...
see ya
Steve Graber, Graber's Pottery, Inc
Claremont, California USA
The Steve Tool - for awesum texture on pots!
www.graberspottery.com steve@graberspottery.com
----- Original Message ----
From: Ron Roy
To: CLAYART@LSV.CERAMICS.ORG
Sent: Sunday, January 13, 2008 3:18:55 PM
Subject: Re: Re ; Lithium
Copper as biocide - I see birds drinking from our bird baths - I wonder how
much dissolved copper birds can handle before they are affected?
I remember someone on this list saying they killed a bunch of fish with
barium glazed aquarium sculptures.
RR
> I dug an old birdbath out of our unpacked
>storage and had it outside with water all summer. Only problem was
>that algae like to grow on the shino glaze. I have been thinking, a
>copper green that won't pass the "acid test" might be the way to go.
>The copper might keep the algae bloom down.
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
______________________________________________________________________________
Clayart members may send postings to: clayart@lsv.ceramics.org
You may look at the archives for the list, post messages, or change your
subscription settings here: http://www.acers.org/cic/clayart/
Moderator of the list is Mel Jacobson who may be reached at melpots2@visi.com
____________________________________________________________________________________
Never miss a thing. Make Yahoo your home page.
http://www.yahoo.com/r/hs
Lee Love on mon 14 jan 08
On 1/14/08, steve graber wrote:
>
> i doubt the birds get anything hazardous from a copper bath, much less silver.
I agree. Less copper than copper pipes. Silver nitrite
is being used in inexpensive ceramic filters for 3rd world water.
Check out Reid Harvey's web page:
http://www.silverceramicsystems.com/
> they also though may very well enjoy that bug zone of algea...
Maybe, but the dogs and cats drink from it too. When you fill the
basin up, the scum breaks free an floats around. You can waste a lot
of water washing the scum out, but a "sanitary" glaze would be less
wasteful.
--
Lee in Mashiko, Japan
http://groups.google.com/group/ClayCraft
"Men are born ignorant, not stupid. They are made stupid by
education." -- Bertrand Russell
Lee Love on mon 14 jan 08
On 1/14/08, Ron Roy wrote:
> I see birds drinking from our bird baths - I wonder how
> much dissolved copper birds can handle before they are affected?
Because of pesticide and fertilizer leaching copper out of our
soil, we are all facing copper deficiencies. Factory raised food
does not have the dietary copper in it we require for a healthy
nervous system. As we know with the Bald eagle, these pesticides
also effect wildlife. These copper deficiencies may be implicated in
neurological diseases BSE and Alzheimer's
In the study I provided earlier, which examined sickness
caused by drinking water, because folks in India switching from
traditional copper and brass water containers to plastic, the amount
needed to keep bacteria from forming, causes less than the daily
requirement of copper in the human diet. *I provide the article from
the archives below.
If we can look at this topic rationally, we can make good use
of our materials for different purposes:
As Edouard has said: "Je n'ai pas peur de mon ombrage"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
/"/*The amounts that circulate into the brass water vessels would not
harm humans, Reed adds. According to the researchers, even a person
drinking 10 litres of such water in a single day would take in less than
the daily recommended dose of copper or zinc.*/ "
from Nature.com
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/*Drinking water stored in brass vessels good for health
Brass jugs polish off disease
Roxanne Khamsi
Traditional pitchers beat plastic in safe water stakes.
Brass water containers could combat many water-borne diseases, according
to microbiologists. The discovery suggests that these vessels should be
used in developing countries, where people typically view cheaper
plastic containers as the better option.
Water-borne diseases remain a serious threat in many poor regions of the
world, with around 2 million children dying each year from diarrhoea.
Efforts to provide safe drinking water have had difficulty reaching
remote areas.
Even in places with basic water-purification systems, people often opt
for riskier wells under trees because the water is cooler, says Rob
Reed, who led the brass study. On a recent trip to India, Reed, a
microbiologist at Northumbria University in Newcastle upon Tyne, UK,
witnessed villagers doing exactly this.
But he also heard an interesting piece of local wisdom: people believe
that traditional brass water containers offer some protection against
sickness. The idea intrigued Reed, who was in Asia investigating the
antibacterial effects of sunlight on water.
He has now found that bacteria are indeed less likely to thrive in brass
water pots than in earthenware or plastic ones. "It's one of the
traditional ideas of water treatment and we were able to find a
microbiological basis for it," he says...
...Plastic beliefs
Brass water pots also easily outperformed plastic ones, the researchers
discovered. Plastic, says Reed, did not inactivate the bacteria. But
many people in developing nations use plastic drinking vessels, because
they view them as more modern...
...Although Reed declines to speculate about exactly how many lives
could be saved by switching to brass, he points to the millions of lives
claimed each year by water-borne diseases. Storing water in brass for
two days could stop this, he suggests: "The potential is great."
*
--
Lee in Mashiko, Japan
http://groups.google.com/group/ClayCraft
"Men are born ignorant, not stupid. They are made stupid by
education." -- Bertrand Russell
| |
|
