Diane Karmiol on tue 2 may 00
I just came across a whole containter of 'Yellow Chrome Oxide'. Has anyone
every done anything with it?
It is a screaming bright yellow. I don't know a thing about it but would love
to try it. Any information would be appreciated.
TIA
Diane in Miami
Iveragh Ceramics on wed 3 may 00
Diane,
There used to be a substance named "Yellow Chromate" which was a
paint used as an undercoat for galvanised metals and aluminium,maybe the
material you have is for making this paint.I have never seen it used in
pottery,but perhaps it could,test and observe.
Regards,
Bob Hollis
----- Original Message -----
From: Diane Karmiol
To:
Sent: 02 May 2000 19:49
Subject: Yellow Chrome Oxide
> ----------------------------Original message----------------------------
> I just came across a whole containter of 'Yellow Chrome Oxide'. Has anyone
> every done anything with it?
> It is a screaming bright yellow. I don't know a thing about it but would
love
> to try it. Any information would be appreciated.
> TIA
> Diane in Miami
>
Paul Lewing on wed 3 may 00
Diane,
I have made glazes using regular green chrome oxide in a VERY high
barium base that were a yellow matrix with green streaks. It took VERY
little chrome, in fact, more than about 0.5% and it went all green. So
you might be able to make bright yellow glazes in a barium base using
this stuff. Keep us posted, please.
Paul Lewing, Seattle
Edouard Bastarache on thu 4 may 00
------------------
Hello Diane=26Bob,
Yellow chrome or yellow chromium are synonyms for lead chromate.
But, I have not seen anything like =22yellow chrome oxide=22 in the =
different
books I own pertaining to toxicology, and also to ceramics.
It may be used in ceramics, when the firing is low, to produce
coral reds in pottery glazes=3B in glassmaking it produces a
deep green.
Later,
Edouard Bastarache
Dans / In =22La Belle Province=22
edouardb=40sorel-tracy.qc.ca
http://www.sorel-tracy.qc.ca/=7Eedouardb/
-----Message d'origine-----
De : Iveragh Ceramics =3Civeragh=40indigo.ie=3E
=C0 : CLAYART=40LSV.UKY.EDU =3CCLAYART=40LSV.UKY.EDU=3E
Date : 3 mai, 2000 15:50
Objet : Re: Yellow Chrome Oxide
=3E----------------------------Original message----------------------------
=3EDiane,
=3E There used to be a substance named =22Yellow Chromate=22 which=
was a
=3Epaint used as an undercoat for galvanised metals and aluminium,maybe the
=3Ematerial you have is for making this paint.I have never seen it used in
=3Epottery,but perhaps it could,test and observe.
=3ERegards,
=3E Bob Hollis
=3E----- Original Message -----
=3EFrom: Diane Karmiol =3CDeeclay=40aol.com=3E
=3ETo: =3CCLAYART=40LSV.UKY.EDU=3E
=3ESent: 02 May 2000 19:49
=3ESubject: Yellow Chrome Oxide
=3E
=3E
=3E=3E ----------------------------Original =
message----------------------------
=3E=3E I just came across a whole containter of 'Yellow Chrome Oxide'. Has
anyone
=3E=3E every done anything with it?
=3E=3E It is a screaming bright yellow. I don't know a thing about it but =
would
=3Elove
=3E=3E to try it. Any information would be appreciated.
=3E=3E TIA
=3E=3E Diane in Miami
=3E=3E
nancy sproul on thu 4 may 00
Diane,
My husband is a Chemistry professor and pulled out one of his books. The
only "bright" yellow chrome we could find was Lead Chromate, PbCrO4. This
is very toxic, both from the lead and the chrome. The chrome is Chromium 6
and is a carcinogen. Before you use this please check it out some more and
maybe have it tested. Hope this helps.
Nancy in SC
>From: Diane Karmiol
>Reply-To: Ceramic Arts Discussion List
>To: CLAYART@LSV.UKY.EDU
>Subject: Yellow Chrome Oxide
>Date: Tue, 2 May 2000 14:49:00 EDT
>
>----------------------------Original message----------------------------
>I just came across a whole containter of 'Yellow Chrome Oxide'. Has anyone
>every done anything with it?
>It is a screaming bright yellow. I don't know a thing about it but would
>love
>to try it. Any information would be appreciated.
>TIA
> Diane in Miami
________________________________________________________________________
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com
Richard Gilbert on thu 4 may 00
Hello Diane,
You may have Potassiumdichromate (Potassium dichromate). It can be used
as a colorant in glazes but it is very toxic. Potassiumdichromate is
bright orange-red crystals or powder and soluble in water. You may
want to try to deserve some as a test. If the chemical stains the water
be careful it is also a fire hazard.
http://www.uiowa.edu/~chemsafe/MSDS/PotassiumDichromate.htm
Richard Gilbert
Cherryville, North Carolina
m.f. boot on fri 5 may 00
Probably its lead-chromate a very poisonous material.
Its bright yellow and it feels fat.
PbCrO4-Pb(OH)2 is the formula
mol.weight 564
Be careful with it.
Frans
----- Oorspronkelijk bericht -----
Van: Paul Lewing
Aan:
Verzonden: woensdag 3 mei 2000 21:58
Onderwerp: Re: Yellow Chrome Oxide
> ----------------------------Original message----------------------------
> Diane,
> I have made glazes using regular green chrome oxide in a VERY high
> barium base that were a yellow matrix with green streaks. It took VERY
> little chrome, in fact, more than about 0.5% and it went all green. So
> you might be able to make bright yellow glazes in a barium base using
> this stuff. Keep us posted, please.
> Paul Lewing, Seattle
>
nancy sproul on fri 5 may 00
Hi Diane,
One thing I forgot to mention. If this substance is Lead Chromate (PbCr04)
it is the same Chromium that is the subject of the movie Erin Brocovich.
This movie is based on fact and took place in California. The chrome is
Chromium 6.
Nancy in SC where it is beginning to get hot
>From: Diane Karmiol
>Reply-To: Ceramic Arts Discussion List
>To: CLAYART@LSV.UKY.EDU
>Subject: Yellow Chrome Oxide
>Date: Tue, 2 May 2000 14:49:00 EDT
>
>----------------------------Original message----------------------------
>I just came across a whole containter of 'Yellow Chrome Oxide'. Has anyone
>every done anything with it?
>It is a screaming bright yellow. I don't know a thing about it but would
>love
>to try it. Any information would be appreciated.
>TIA
> Diane in Miami
________________________________________________________________________
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com
Edouard Bastarache on fri 5 may 00
------------------
Hello,
another synonym for this material is=22Lead chromate(VI)=22 because it =
contains
hexavalent chromium which is usually quite more toxic than trivalent
chromium(III).
But, here is an excellent scientific abstract on the subject of
transformation
from hexavalent(VI) to trivalent chromium(III) when in contact with everyday
liquids
and body fluids.
I am posting this abstract mainly for those interested in glaze metal
leaching:
TITLE: Refined exposure assessment for ingestion of tapwater contaminated
with hexavalent chromium: consideration of exogenous and endogenous reducing
agents.
AUTHORS: Kerger BD=3B Richter RO=3B Chute SM=3B Dodge DG=3B Overman SK=3B =
Liang J=3B
Finley BL=3B Paustenbach DJ
AUTHOR AFFILIATION: McLaren/Hart-ChemRisk, Irvine, CA 92714, USA.
SOURCE: J Expo Anal Environ Epidemiol=3B VOL 6, ISS 2, 1996, P163-79
SECONDARY SOURCE ID: TOXBIB/96/384407
ABSTRACT: Laboratory studies were conducted to determine how rapidly and
completely chromium (VI) =5BCr(VI)=5D is reduced upon contact with common
beverages mixed with tapwater. Studies were performed for five common
beverages (coffee, tea, orange juice, Kool Aid, and powdered lemonade)
spiked with either 10 or 50 mg Cr(VI)/l. The concentrations of Cr(VI) were
measured at several time intervals for up to four hours. It was demonstrated
that each of these beverages had the capacity to reduce a concentration of =
=3E
or =3D 8 mg Cr(VI)/l within a 15-minute time frame, and that continued
monitoring of the beverages revealed greater reduction of the Cr(VI). These
findings are consistent with the observation that many foods and beverages,
as well as endogenous body fluids such as saliva and gastric juices, are
capable of reducing substantial quantities of Cr(VI) to Cr(III). Our
exposure assessment shows that the estimated high-end ingested dose of
Cr(VI) from tapwater at both 1 and 5 mg Cr(VI)/l is generally two to three
orders of magnitude below doses shown to have no adverse health effect in
animal studies. When considered in conjunction with studies demonstrating
that the reductive capacity of gastric juices may exceed 50 mg Cr(VI) daily,
these observations suggest that little or no Cr(VI) is likely to be absorbed
orally at a reasonable water concentration of Cr(VI), since tapwater is
bright yellow at 5 mg Cr(VI)/l.
MAIN MESH HEADINGS: Beverages/=2AANALYSIS
=2AChromium
=2AChromium/ADMINISTRATION =26 DOSAGE
=2AChromium/ANALYSIS
=2AChromium/CHEMISTRY
Environmental Exposure/=2ASTATISTICS =26 NUMER DATA
=2AReducing Agents
=2AReducing Agents/ANALYSIS
=2AReducing Agents/CHEMISTRY
=2ASoil Pollutants
=2ASoil Pollutants/ADMINISTRATION =26 DOSAGE
=2ASoil Pollutants/ANALYSIS
=2AWater Supply
ADDITIONAL MESH HEADINGS: Adult
Child, Preschool
Citrus/CHEMISTRY
Coffee/CHEMISTRY
Female
Human
Male
Middle Age
Models, Biological
Risk Assessment
Tea/CHEMISTRY
PUBLICATION TYPES: JOURNAL ARTICLE
CAS REGISTRY NUMBERS: 0 (Reducing Agents)
0 (Soil Pollutants)
7440-47-3 (Chromium)
LANGUAGES: Eng
Edouard Bastarache
Dans / In =22La Belle Province=22
edouardb=40sorel-tracy.qc.ca
http://www.sorel-tracy.qc.ca/=7Eedouardb/
-----Message d'origine-----
De : m.f. boot =3Cm.boot=40hccnet.nl=3E
=C0 : CLAYART=40LSV.UKY.EDU =3CCLAYART=40LSV.UKY.EDU=3E
Date : 5 mai, 2000 15:44
Objet : Re: Yellow Chrome Oxide
=3E----------------------------Original message----------------------------
=3EProbably its lead-chromate a very poisonous material.
=3EIts bright yellow and it feels fat.
=3EPbCrO4-Pb(OH)2 is the formula
=3Emol.weight 564
=3EBe careful with it.
=3E Frans
=3E
=3E
=3E----- Oorspronkelijk bericht -----
=3EVan: Paul Lewing =3Cpjlewing=40worldnet.att.net=3E
=3EAan: =3CCLAYART=40LSV.UKY.EDU=3E
=3EVerzonden: woensdag 3 mei 2000 21:58
=3EOnderwerp: Re: Yellow Chrome Oxide
=3E
=3E
=3E=3E ----------------------------Original =
message----------------------------
=3E=3E Diane,
=3E=3E I have made glazes using regular green chrome oxide in a VERY high
=3E=3E barium base that were a yellow matrix with green streaks. It took =
VERY
=3E=3E little chrome, in fact, more than about 0.5=25 and it went all green.=
So
=3E=3E you might be able to make bright yellow glazes in a barium base using
=3E=3E this stuff. Keep us posted, please.
=3E=3E Paul Lewing, Seattle
=3E=3E
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