Mitsuru Cope on wed 20 dec 00
Please tell me how dangerous for application and firing underglaze which
contains cadmium? Does cadmium absorb through skin?
I saw a Don Reitz's beautiful tea bowl on Ceramics Monthly ad. He used Amaco
velvet underglaze 383 and wood fired it at cone 11. It looked fabulous, so I
ordered it without knowing the contents.
My local ceramic supplier told me that cadmium melts around cone 01,
therefore, there is no danger of cadmium if I fire at cone 5.
Mitsuru Cope
Cindy Strnad on thu 21 dec 00
Mitsuru,
I don't know if cadmium absorbs through the skin. If anyone can tell you
that, it will be Edouard Bastarche (hope I spelled that right, Bass).
However, I do have a solution for you. Use gloves, and be careful not to
splash. Wash up well afterwards.
Most important, do not breathe fumes from the kiln.
Cindy Strnad
Earthen Vessels Pottery
RR 1, Box 51
Custer, SD 57730
USA
earthenv@gwtc.net
http://www.earthenvesselssd.com
John Hesselberth on thu 21 dec 00
Mitsuru Cope wrote:
>Please tell me how dangerous for application and firing underglaze which
>contains cadmium? Does cadmium absorb through skin?
>
>I saw a Don Reitz's beautiful tea bowl on Ceramics Monthly ad. He used Amaco
>velvet underglaze 383 and wood fired it at cone 11. It looked fabulous, so I
>ordered it without knowing the contents.
>
>My local ceramic supplier told me that cadmium melts around cone 01,
>therefore, there is no danger of cadmium if I fire at cone 5.
>
>Mitsuru Cope
Hi Mitsuru,
I'm not understanding your question since Monona Rossol and I both posted
notes on the dangers of cadmium within the last day or two. Did we miss
something or did you not see those posts. If you didn't see the posts
please check the archives and then reask your question if there is still
something that needs clarification.
Regards, John
"The life so short, the craft so long to learn." Hippocrates, 5th cent.
B.C.
Wade Blocker on thu 21 dec 00
Mitsuru,
Cadmium is fugitive at higher temperatures. So what you are using is
probably a stain made with encapsuled cadmium which is considered to be
safe. Mia in ABQ
Earl Brunner on thu 21 dec 00
Had a college professor that was diagnosed with cadmium poisoning, seems
he would smear his paints on his canvas frequently with his thumb or
fingers as he worked instead of just using his brushes.....
Cindy Strnad wrote:
> Mitsuru,
>
> I don't know if cadmium absorbs through the skin. If anyone can tell you
> that, it will be Edouard Bastarche (hope I spelled that right, Bass).
> However, I do have a solution for you. Use gloves, and be careful not to
> splash. Wash up well afterwards.
>
> Most important, do not breathe fumes from the kiln.
>
> Cindy Strnad
> Earthen Vessels Pottery
> RR 1, Box 51
> Custer, SD 57730
> USA
> earthenv@gwtc.net
> http://www.earthenvesselssd.com
>
> ______________________________________________________________________________
> 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.
--
Earl Brunner
http://coyote.accessnv.com/bruec
mailto:bruec@anv.net
Edouard Bastarache on thu 21 dec 00
Allo Cindi,
check my signature for spelling "goofs"(Hehehehe)
Cadmium & Compounds
Compounds : cadmium oxide; cadmium carbonate; cadmium chloride;cadmium
sulfate; cadmium sulfide.
Uses : The metal is used in electroplating, in solder for aluminium, as a
constituent of easily fusible
alloys, as a deoxidizer in nickel plating, in process engraving, in
cadmium-nickel batteries,
and in reactor control rods.
Cadmium compounds are employed as TV phosphors, as pigments in glazes an=
d
enamels, in
dyeing and printing, and in semi-conductors and rectifiers.
Exposure : Inhalation( in the occupational setting)
Toxicology : Cadmium oxide fume is a severe pulmonary irritant; cadmium
dust is a less potent irritant
than cadmium fume because it has a larger particle size. Chronic exposu=
re
is associated
with nephrotoxicity. Several inorganic cadmium compounds cause malignan=
t
tumors in
animals.
Inhalation exposure to high levels of cadmium fumes or dust is intensely
irritating to
respiratory tissue. Particle size appears to be a more important
determinant of toxicity
than chemical form. However, most acute intoxications have been caused =
by
inhalation
of cadmium fume at concentrations that did not provide sufficient warni=
ng
symtoms of
irritation. Concentrations of fume responsible for fatalities have bee=
n
40 to 50 mg/m3
for 1 hour or 9 mg/m3 for 5 hours. There has been non-fatal cases at lo=
wer
concentrations.Pulmonary symptoms and clinical signs reflect lesions rang=
ing
from nasopharyngeal and bronchial irritation to pulmonary edema with als=
o
possibly headache, chills, muscle aches, nausea, vomiting, and diarrhea.
Among survivors , the subsequent course is unpredictable ; most cases
resolve slowly, but respiratory symptoms may linger for several weeks, an=
d
impairment of pulmonary function may persists for months.
Long-term inhalation exposure at low levels leads to decreased lung
function and
emphysema.
Chronic exposure to cadmium results in renal damage which may continue =
to
progress
even after exposure ceases.
Other consequences of cadmium exposure are : anemia, yellow discolorati=
on
of the teeth,
rhinitis, occasional ulceration of the nasal septum, damage to the
olfactory nerve, and
anosmia.
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,
=AB itai-itai =BB (ouch-ouch) disease.The affliction is characterized b=
y pain
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.
Occupational exposure to cadmium has been implicated in a significant
increase of lung
cancer. The IARC has determined that there is sufficient evidence in
humans for the
carcinogenicity of cadmium and cadmium compounds. It also appears that
cadmium has
the capability to alter genetic materials, particularly chromosomes.
The 1995 ACGIH threshod limit value-time-weighted average (TLV-TWA) for
elemental
cadmium and compounds as Cd is 0.01 mg/m3 for total particulate dust (whi=
le
it is 10mg/m3 for titanium dioxide, in Quebec); or 0.002 mg/m3 for the
respirable fraction of dust , there is an A 2 suspected human carcinogen
designation for both forms.
The urinary excretion of cadmium itself bears no known relationship to =
the
severity or
duration of exposure and is only the confirmation of absorption.Absorbe=
d
cadmium is
retained in the body to a large extent, and excretion is very slow.
The important thing is your level of exposure to cadmium, it may vary if
you are a pottery factory worker, a teacher, a full-time studio potter or=
a
part-time.It certainly
depends also on the amount used over a given period of time . In the wet
state, these compounds are certainly much less hazardous than as dust
(route of entry being inhalation).Factories can afford the monitoring of
cadmium exposure but it is not the same for artists and craftpersons.
Edouard Bastarache M.D. (Occupational & Environmental Medicine)
Author of =AB Substitutions for raw ceramic materials =BB
edouardb@sorel-tracy.qc.ca
http://sorel-tracy.qc.ca/~edouardb/
Reference :
Chemical Hazards of the Workplace, Proctor & Hughes, 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 : Cindy Strnad
=C0 :
Envoy=E9 : 21 d=E9cembre, 2000 10:40
Objet : Re: cadmium toxicity for firing/application
> Mitsuru,
>
> I don't know if cadmium absorbs through the skin. If anyone can tell yo=
u
> that, it will be Edouard Bastarche (hope I spelled that right, Bass).
> However, I do have a solution for you. Use gloves, and be careful not t=
o
> splash. Wash up well afterwards.
>
> Most important, do not breathe fumes from the kiln.
>
> Cindy Strnad
> Earthen Vessels Pottery
> RR 1, Box 51
> Custer, SD 57730
> USA
> earthenv@gwtc.net
> http://www.earthenvesselssd.com
>
>
_________________________________________________________________________=
___
__
> 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.
Martin Howard on fri 22 dec 00
There are many sites in GB which were contaminated by factory waste
containing cadmium. They have proved to be some of the most intractable to
deal with.
It was that which made me put cadmium in the real baddy corral.
Martin Howard
Webb's Cottage Pottery
Woolpits Road, Great Saling
BRAINTREE, Essex CM7 5DZ
England
martin@webbscottage.co.uk
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