Cheryl L Litman on tue 16 nov 99
>>>I still do not feel that I have a definitive answer about encapsulated
cadmium stains, which is of course what this discussion has been all
about. <<<
I thought the definitive answer has been given over and over by John
Hesselbeth...
Send it to Alfred to be tested.
There is no other definitive answer, only supposition.
Cheryl Litman
Somerset, NJ
email: cheryllitman@juno.com
From: Don & June MacDonald
To: CLAYART@LSV.UKY.EDU
Date: Mon, 15 Nov 1999 14:27:55 EST
Subject: Re: Hazards of encapsulated cadmium stains (fwd)
Message-ID:
----------------------------Original message----------------------------
Thank you for the opinions given on my request for information about
cadmium. We were talking about cadmium inclusion stains which are
advertised as being "safe" in all the ceramic advertising, and when they
first came into the suppliers, no-one knew much about them, except that
it was now possible to make these bright colours, previously
unavailable. I try at all times to ensure that things are safe for
users, students, myself, and the end user of the product, however I
might point out that there are so many opinions as to the relative
safety of everything we use that it is sometimes difficult to determine
what is reality, and what is 'old wives tales'. It seems sometimes that
today's relatively safe ingredient turns into tomorrow's dreadful
poison. Also, when they take the lead out of gasoline and add manganese
instead, the small amount of adding to the chemical soup that a potter
does in comparison to all of the drivers on the road seems somewhat
irelevant.
I do appreciate and pay attention to the articles and warnings that
Monona gives us all. But as my daughter said, after a visit to Bangkok,
until the whole world pays attention to air and other pollution, lots of
that pollution caused by North American ownership, we in North America
are just spitting against the wind.
I still do not feel that I have a definitive answer about encapsulated
cadmium stains, which is of course what this discussion has been all
about.
June
Elke Blodgett wrote:
>
> ----------------------------Original
message----------------------------
>
> from Monona
>
> >
> > ---------- Forwarded message ----------
> > Date: Thu, 11 Nov 1999 17:12:28 EST
> > From: Don & June MacDonald
> > Reply-To: Ceramic Arts Discussion List
> > To: CLAYART@LSV.UKY.EDU
> > Subject: Re: Hazards of encapsulated cadmium stains (fwd)
> > Resent-Subject: Re: Hazards of encapsulated cadmium stains
(fwd)
> >
> > ----------------------------Original
message----------------------------
> > Somewhere I seem to have missed something. Just how toxic,
poisonous
> > etc. is cadmium? I know that it is used in the paint world for
cadium
> > yellow, cadmium red. I have a student who is using these colours to
put
> > little fish all over her pieces, a glaze inlay process and very
> > creative, and I hate to tell her not to use the colours, but I have
100
> > other students putting things in the kilns, all fired to Cone 6, and
I
> > do not want to take risks with their work.
> > Thanks for any information you can give me,
> > June
> >
> You say you "have a student" using cadmium. If you are a teacher in a
public
> school or in a university, your administrators are obligated by law to
> provide hazard communication training that would include assessing the
> toxicity of your materials by reading MSDSs, by comparing threshold
limit
> values, and other means.
>
> Comparative toxicity is not an easy question, and it takes time and
> education. But in the case of cadmium, there is not many metals you
can use
> that are more toxic. By inhalation the air quality limits (threshold
limit
> values) for cadmium are even more restrictive than for arsenic. It is
a
> potent carcinogen and kidney toxin in particular.
>
> And if the students are children, they have no business using cadmium
or
> lead. Only people who can understand the hazards, who can carry out
> precautions effectively and consistently, and are of an age to be able
give
> legal informed consent to accept the risks should be using things this
toxic.
>
> Monona Rossol
> ACTS
> 181 Thompson St., # 23
> NYC NY 10012-2586 212/777-0062
Cheryl Litman
Somerset, NJ
email: cheryllitman@juno.com
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