Edouard Bastarache on mon 8 nov 99
------------------
Hello Ron =26 all,
here is what, Cerdec, a maker of encapsulated stains claims.
Later,
Finally, because of the technology used to encapsulate the cadmium within =
the
pigments, the cadmium solubility of inclusion pigment glazes is very low. =
Tests
have shown that the cadmium released by inclusion pigment glazes can be up =
to
one thousand times less than that of conventional free cadmium glazes.
Edouard Bastarache
edouardb=40sorel-tracy.qc.ca
http://www.sorel-tracy.qc.ca/=7Eedouardb/
Ron Roy on tue 9 nov 99
Thanks Edouard - some of your message is missing?
I did notice in one of the pottery supply catalogues that the main danger
could be in handling the raw material - like when mixing glazes.
I am loath to take the manufactures word on this kind of thing - being of
suspicious nature. I did attend a talk by a Degussa rep and he did mention
that it is difficult for them to make sure all the colour was encapsulated
- or rather it was difficult to separate the good from the bad. This is why
I brought up the point that different lots may vary in this respect.
RR
>----------------------------Original message----------------------------
>------------------
>Hello Ron & all,
>
>here is what, Cerdec, a maker of encapsulated stains claims.
>
>
>
>Later,
>
>
>
>
>
>Finally, because of the technology used to encapsulate the cadmium within the
>pigments, the cadmium solubility of inclusion pigment glazes is very low. Tests
>have shown that the cadmium released by inclusion pigment glazes can be up to
>one thousand times less than that of conventional free cadmium glazes.
>
>Edouard Bastarache
>edouardb@sorel-tracy.qc.ca
>http://www.sorel-tracy.qc.ca/~edouardb/
Ron Roy
93 Pegasus Trail
Scarborough
Ontario, Canada
M1G 3N8
Evenings 416-439-2621
Fax 416-438-7849
Mark & Pauline Donaldson-Drzazga on fri 19 nov 99
-------------------
Dear Ray Aldridge,
I cant say I have followed this thread fully, but..... I couldn't agree with=
you
more how some people try to take the high ground. Bloody prima donnas=21
Unfortunately this happens in all walks of life.
Happy potiing Marek http://www.moley.uk.com
Nick Zappa on fri 22 jun 01
Has anyone had any dealings with Cadmium? My wife who has been a full =
time potter with me for the last 25 or so years has a high level in her =
system. We are trying to track down the source. We only fire at cone 10 =
reduction and our clay supplier has assured us that in our chemical =
list and clay bodies it is not present. I have read some on this =
material and am considering ink from newspaper and our water supply as a =
possible suspect. Thanks for any info. Nick Zappa
Zappa Pottery & Gallery Inc.
18800 P-61 Trail
Montrose CO. 81401
www.zappapottery.com
info@zappapottery.com
970.249.6819 Studio
970.252.0303 Gallery
970.252.0104 Fax
Edouard Bastarache on fri 22 jun 01
Hey Zap,
have you been checked also?
If you put aside occupational exposure, cadmium is present in:
1-Food
2-Cigarette smoke(the main source of contamination in the general
population).
3-Urban atmospheric air (levels may be high in the vicinity
of cadmium producing facilities)
4-Lichen and moss ( they accumulate cadmium as well as other heavy metals=
).
Cadmium is poorly absorbed by ingestion.
Chronic exposure to high levels of cadmium in food has caused bone
disorders, including osteoporosis and osteamalacia.
Long term ingestion, by a Japanese population, of water and food
contaminated with cadmium, was associated with a crippling condition,
itai-itai =BB (ouch-ouch) disease.The affliction is characterized by pai=
n in
the back and joints, osteomalacia (adult rickets), bone fractures, and
occasional renal failure, and most often affects women with multiple risk
factors such as multiparity and poor nutrition.
Hope this helps.
Later,
References:
1-Toxicologie Industrielle et Intoxications Professionnelles, R.R Lauwery=
s,
last edition
2-Chemical Hazards of the Workplace, Proctor & Hughes, last edition
3-Hazardous Materials Toxicology, Sullivan & Krieger, last edition
4-Occupational & Environmental Medicine, J. Ladou, last edition.
Edouard Bastarache
Irr=E9ductible Qu=E9becois
Sorel-Tracy
Dans / In "La Belle Province"
edouardb@sorel-tracy.qc.ca
http://www.sorel-tracy.qc.ca/~edouardb/
----- Message d'origine -----
De : Nick Zappa
=C0 :
Envoy=E9 : 22 juin, 2001 15:22
Objet : cadmium
Has anyone had any dealings with Cadmium? My wife who has been a full tim=
e
potter with me for the last 25 or so years has a high level in her system.
We are trying to track down the source. We only fire at cone 10 reduction
and our clay supplier has assured us that in our chemical list and clay
bodies it is not present. I have read some on this material and am
considering ink from newspaper and our water supply as a possible suspect.
Thanks for any info. Nick Zappa
Zappa Pottery & Gallery Inc.
18800 P-61 Trail
Montrose CO. 81401
www.zappapottery.com
info@zappapottery.com
970.249.6819 Studio
970.252.0303 Gallery
970.252.0104 Fax
_________________________________________________________________________=
___
__
Send postings to clayart@lsv.ceramics.org
You may look at the archives for the list or change your subscription
settings from http://www.ceramics.org/clayart/
Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
John Baymore on sat 23 jun 01
My wife who has been a full time potter with me for the last 25 or so =
years has a high level in her system. We are trying to track down =
the source.
Nick,
Sorry to hear about your wife's high Cd level.
First advice, get a good occupational health specialist involved if you
haven't already. They should be of help in tracking down the source(s). =
Since you have already had this type of testing done... and this kind of
metals testing is not typically a "routine" GP type work at an average
physical......... I'll bet that you probably already have one
involved....so this advice may already be moot. =
Second..... this is the kind of stuff that Monona Rossol at A.C.T.S in NY=
C
understands. Get ahold of her......... she could be a GREAT resource. S=
he
can be reached at her 75054.2542@Compuserve.com address. I'll bet she ca=
n
point you to some really good resources.
The so-called "source" may not be any ONE source, but in fact multiple
small ones. This is the "total body burden" concept. Maybe a tiny
exposure from wrapping pots with colored ink newspaper adds at craft fair=
s
and eating the cookie. A tad from the smoke from rakuing with colored
newspaper ads mixed in. Some from smoking a few cigarettes a day. Maybe=
a
small exposure from your well water. Some from a local source of air
pollution. A tiny bit from that painting class where she did the lovely
red sunset picture. Maybe an exposure from the beautiful little blood re=
d
cup that the elementary school son or daughter made for Mother's Day. An=
d
so on and so on. Any one by itself might not be all that problematic. B=
ut
add them together and ....... bingo! =
Cadmium turns up in a lot of places in life.
As to ceramics.......... there is cadmium colorant in many of the
red/orange shades of commercial underglaze, overglaze, luster, glaze,
slips, potter's pencils, chalks, and pens, and so on. If she has worked
with these kinds of materials much, that could be a source.
Another source may be a pot (or pots) that you have purchased or been giv=
en
done by another potter that you eat off of regularly!!!!! Unfortunately,=
as we often discuss here on CLAYART......... a solid understanding of gla=
ze
chemistry and solubility of glazes is not all that common in handcraft
potters. Or possibly even a commercial set of pottery you own.
Check Michael McCann's "Artist Beware" for some background on other art
media that contain cadmium.
Crucial question....are you BOTH affected? THAT could help trace the
possible source(s).
Also......... we ASSUME that our materials are what they say on the
package. Actually it is a pretty silly assumption unless the packaging i=
s
the original mfgr.'s source bag. Sometimes mistakes happen. Someone cou=
ld
have dumped the wrong thing in the wrong place sometime at a middleman
supplier, and if she was pretty "cavilier" about handling the so-called
"safe" meterials.... because they of course are "safe"........... then th=
at
could be an exposure route too. Unlikely....but possible.
Hope this is of some help. Best of luck.
Best,
.....................john
John Baymore
River Bend Pottery
22 Riverbend Way
Wilton, NH 03086 USA
603-654-2752 (s)
800-900-1110 (s)
JohnBaymore.com
JBaymore@compuserve.com
John.Baymore@GSD-CO.com
"Earth, Water, and Fire Noborigama Woodfiring Workshop August 17-26,
2001"
kate champa on sun 29 sep 02
By the by, as far as I know cadmium is worse than lead.
Edouard Bastarache on sun 29 sep 02
Hello all,
to know more about cadmium and ceramics go to:
http://perso.wanadoo.fr/smart2000/Cadmium.htm
or cadmium "per se":
http://digitalfire.com/education/toxicity/materialsafety.html
Later,
Edouard Bastarache
Irreductible Quebecois
Indomitable Quebeker
Sorel-Tracy
Quebec
edouardb@sorel-tracy.qc.ca
http://sorel-tracy.qc.ca/~edouardb/
http://perso.wanadoo.fr/smart2000/index.htm
----- Original Message -----
From: kate champa
To:
Sent: Sunday, September 29, 2002 9:29 AM
Subject: cadmium
> By the by, as far as I know cadmium is worse than lead.
>
>
____________________________________________________________________________
__
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
Paul Lewing on fri 10 oct 03
I'm looking for information on cadmium as a colorant. Does anyone know when
it came into use as a colorant, and where? And where does it come from, and
how is it mined and processed?
Thanks,
Paul Lewing, Seattle
Edouard Bastarache Inc. on sat 11 oct 03
Hello Paul,
go to Smart's site, he has written an excellent article
on the technology of cadmiun.
http://perso.wanadoo.fr/smart2000/Cadmium.htm#english%20legis
Later,
"Ils sont fous ces quebecois"
Edouard Bastarache
Irreductible Quebecois
Indomitable Quebeker
Sorel-Tracy
Quebec
edouardb@sorel-tracy.qc.ca
http://sorel-tracy.qc.ca/~edouardb/
http://perso.wanadoo.fr/smart2000/index.htm
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