ACTSNYC@cs.com on tue 9 may 00
>
> ---------- Forwarded message ----------
> Date: Mon, 8 May 2000 00:15:01 EDT
> From: Tom Buck
> Reply-To: Ceramic Arts Discussion List
> To: CLAYART@LSV.UKY.EDU
> Subject: Re: WAS: Yellow Chrome Oxide, NOW: Potassium Bi/Di?
> Resent-Subject: Re: WAS: Yellow Chrome Oxide, NOW: Potassium Bi/Di?
> ----------------------------Original message----------------------------
> Angie:
> There are two common compounds of potassium and chromium: 1)
> Potassium chromate, yellow, K2Cr(VI)O4; and 2) Potassium Dichromate, (aka
> BIchromate), yellowish red, K2Cr2O7 (Chromium is still hexavalent, ie, the
> poisonous ion as Dr Edouard B has noted earlier).
> Compound 1, K2CrO4 is declared to be highly toxic by ingestion and
> inhalation. To be safe air should not contain more than 0.1 mg per cubic
> metre. This compound is fairly stable and doesn't release free oxygen; it
> melts at 971 oC.
SNIP
I read all these "yellow chrome oxide and potassium dichromate" posts and
really can't understand why people would buy or use a chemical without
knowing what it was. Get the MSDS or don't use/buy the chemical. And if the
MSDS doesn't have the Chemical Abstract Service (CAS) registration number,
call the manufacturer and get it.
This post is also a good illustration of why we should never depend on
"common names" of chemicals. They are inaccurate and misleading.
Monona Rossol
ACTS
181 Thompson St., # 23
NYC NY 10012-2586 212/777-0062
ACTSNYC@cs.com
Earl Brunner on wed 10 may 00
Well they do that because they have been poorly brought up.
Half the teachers out there have a lousy safety protocol and
they pass it on to their students who pass it on to theirs.
That's what makes this list a great thing. And we get new
people on it all the time that have to learn. The preaching
is
not to the choir, it's a whole new congregation on a regular
basis.
ACTSNYC@cs.com wrote:
>
> ----------------------------Original message----------------------------
> I read all these "yellow chrome oxide and potassium dichromate" posts and
> really can't understand why people would buy or use a chemical without
> knowing what it was. Get the MSDS or don't use/buy the chemical. And if the
> MSDS doesn't have the Chemical Abstract Service (CAS) registration number,
> call the manufacturer and get it.
>
> This post is also a good illustration of why we should never depend on
> "common names" of chemicals. They are inaccurate and misleading.
>
> Monona Rossol
> ACTS
> 181 Thompson St., # 23
> NYC NY 10012-2586 212/777-0062
>
> ACTSNYC@cs.com
--
Earl Brunner
http://coyote.accessnv.com/bruec
mailto:bruec@anv.net
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