Dan Saultman on mon 8 sep 97
Hi There,
Can Vanadium Pentoxide hold it's color in a cone 6 oxidation
temperature. Any recipes that might work?
Thanks for your thoughts
Dan Saultman
Sharon Pollock-De Luzio on sun 2 may 99
Years ago I container of vanadium pentoxide fell off an overhead shelf onto
my face. I called poison control and everyone else I could think of and
never got any information. I can still see so I suppose I'm ok.
Does anyone know exactly what the dangers of vanadium penoxide are? Is it
safe fired in a glaze or is there risk of release.
-Sharon in RI
Carol Seidman wrote:
> ----------------------------Original message----------------------------
> Todd, My comment was to alert anyone not knowing the danger "Dont Try
> This At Home". I recently learned that a glaze chemical I was using is
> very toxic (Vanadium Pentoxide). No warnings in my suppliers catalogue,
> formulas available in books with no warning, I just didn't know until
> someone on clayart mentioned it. Wrote to Monona and she clued me in,
> bad stuff . So my point is, there are so many folks learning to make
> pottery, grabbing information here and there, and thinking that if you
> dont use lead in your glaze, you're okay. Carol
>
> > Todd Nelson wrote:
> >
> > Carol, Please finish reading my post before reply. Norm asked for a
> > recipe and I gave him what I learned at a workshop. No, I don't
> > cook it up in my studio. I use 125 degree wax with no additions. It
> > goes on smooth and wipes off very easily. The napalm is too close to
> > an accident for me to use. Between the smell and the volitility I
> > won't ever try it again. Sure wish someone would make a resist that
> > works as good. L&R Specialties in Nixa, Mo. sells one that works good
> > on bisque but not over glaze. Axner's green stuff works best over
> > glaze if you can wait a day for it to dry. Pushing mud, Todd
Edouard Bastarache on mon 3 may 99
------------------
Hello Sharon,
Fume is recognized as being generally more toxic than dust because of the
smaller
particle size of fume, which allows more complete penetration to the small
airways of the lungs.
The absorption of V2O5 by inhalation is nearly 100=25.
Poison by ingestion, inhalation, and other routes of entry like
intraperitoneal, sub-cutaneous, intrathecal and intravenous.
Human systemic effects by inhalation:
-bronchiolar constriction,
-including asthma,
-cough,
-dyspnea(shortness of breath),
-sputum,
-conjonctiva irritation.
A respiratory irritant=3B
causes skin pallor, greenish-black tongue, chest pain, dyspnea, palpitation,
lung changes.
When ingested it causes gastrointestinal tract disturbances.
It may also cause a papular skin rash.
An experimental teratogen,
experimental reproductive effects,
mutagenic data.
When heated to decomposition it emits acrid smoke and irritating fumes of
VOx.
References:
Dangerous Properties of Industrial Materials by Sax and Lewis.
Chemical Hazards of the Workplace by Proctor and Hughes.
Edouard Bastarache
In =22La Belle Province=22
edouardb=40sorel-tracy.qc.ca
http://www.sorel-tracy.qc.ca/=7Eedouardb/
-----Message d'origine-----
De : Sharon Pollock-De Luzio =3Csepdl=40concentric.net=3E
=C0 : CLAYART=40LSV.UKY.EDU =3CCLAYART=40LSV.UKY.EDU=3E
Date : 2 mai, 1999 19:43
Objet : Vanadium pentoxide
=3E----------------------------Original message----------------------------
=3EYears ago I container of vanadium pentoxide fell off an overhead shelf =
onto
=3Emy face. I called poison control and everyone else I could think of and
=3Enever got any information. I can still see so I suppose I'm ok.
=3E
=3EDoes anyone know exactly what the dangers of vanadium penoxide are? Is =
it
=3Esafe fired in a glaze or is there risk of release.
=3E
=3E-Sharon in RI
=3E
=3ECarol Seidman wrote:
=3E
=3E=3E ----------------------------Original =
message----------------------------
=3E=3E Todd, My comment was to alert anyone not knowing the danger =22Dont =
Try
=3E=3E This At Home=22. I recently learned that a glaze chemical I was =
using is
=3E=3E very toxic (Vanadium Pentoxide). No warnings in my suppliers =
catalogue,
=3E=3E formulas available in books with no warning, I just didn't know until
=3E=3E someone on clayart mentioned it. Wrote to Monona and she clued me in,
=3E=3E bad stuff . So my point is, there are so many folks learning to make
=3E=3E pottery, grabbing information here and there, and thinking that if =
you
=3E=3E dont use lead in your glaze, you're okay. Carol
=3E=3E
=3E=3E =3E Todd Nelson wrote:
=3E=3E =3E
=3E=3E =3E Carol, Please finish reading my post before reply. Norm asked =
for a
=3E=3E =3E recipe and I gave him what I learned at a workshop. No, I =
don't
=3E=3E =3E cook it up in my studio. I use 125 degree wax with no additions.=
It
=3E=3E =3E goes on smooth and wipes off very easily. The napalm is too =
close to
=3E=3E =3E an accident for me to use. Between the smell and the volitility =
I
=3E=3E =3E won't ever try it again. Sure wish someone would make a resist =
that
=3E=3E =3E works as good. L=26R Specialties in Nixa, Mo. sells one that =
works good
=3E=3E =3E on bisque but not over glaze. Axner's green stuff works best =
over
=3E=3E =3E glaze if you can wait a day for it to dry. Pushing mud, Todd
Jeff van den Broeck on mon 30 aug 99
I'm very interested in the opinions of experts about all sorts of health
hazards potters (and their customers) are exposed to.
Recently I read a book that's already available since 1996. The title:The
Potter's Palette by Christine Constant and Steve Ogden. They give some
warnings about risks and health hazards, but as they're using in their
blends systematically Vanadium pentoxide, I would like to know more about
this (expensive) metal oxide, that the authors list as a toxic product. Can
somebody tell me more about the toxicity: as raw material, as glaze, low or
high fired? Many thanks.
Jeff van den Broeck - P.O.Box 1099
Baguio City 2600 - Philippines
jvdb@skyinet.net
Edouard Bastarache on tue 31 aug 99
------------------
Hello Jeff,
Fume is recognized as being generally more toxic than dust because of the
smaller
particle size of fume, which allows more complete penetration to the small
airways of the lungs.
The absorption of V2O5 by inhalation is nearly 100=25.
Poison by ingestion, inhalation, and other routes of entry like
intraperitoneal, sub-cutaneous, intrathecal and intravenous.
Human systemic effects by inhalation:
-bronchiolar constriction,
-including asthma,
-cough,
-dyspnea(shortness of breath),
-sputum,
-conjonctiva irritation.
A respiratory irritant=3B
causes skin pallor, greenish-black tongue, chest pain, dyspnea, palpitation,
lung changes.
When ingested it causes gastrointestinal tract disturbances.
It may also cause a papular skin rash.
An experimental teratogen,
experimental reproductive effects,
mutagenic data.
When heated to decomposition it emits acrid smoke and irritating fumes of
VOx.
The key to answering your question is your level of exposure.
In the =22wet state=22 as in a glaze, its quite less toxic because
you don't breathe in wet glazes.
Fumes coming out of the kiln when firing could be acrid and
irritating as already stated above.
As for wares leaching vanadium compounds, the door is opened
to discussion to everyone, many factors are involved and there is
nothing like testing your glazes to see if they leach vanadium
pentoxide(poison by ingestion), or other vanadium compounds.
A high fire well balanced glaze should be safer than the opposite.
But i don't know the fate of this chemical in the glaze mix when
heated to maturity, so i cannot discuss correctly this leaching
problem.
Later,
Edouard Bastarache M.D.(Occupational =26 Environmental Medicine)
In =22La Belle Province=22
edouardb=40sorel-tracy.qc.ca
http://www.sorel-tracy.qc.ca/=7Eedouardb/
References:
Dangerous Properties of Industrial Materials by Sax and Lewis.
Chemical Hazards of the Workplace by Proctor and Hughes.
-----Message d'origine-----
De : Jeff van den Broeck =3Cjvdb=40skyinet.net=3E
=C0 : CLAYART=40LSV.UKY.EDU =3CCLAYART=40LSV.UKY.EDU=3E
Date : 30 ao=FBt, 1999 16:54
Objet : Vanadium pentoxide
----------------------------Original message----------------------------
I'm very interested in the opinions of experts about all sorts of health
hazards potters (and their customers) are exposed to.
Recently I read a book that's already available since 1996. The title:The
Potter's Palette by Christine Constant and Steve Ogden. They give some
warnings about risks and health hazards, but as they're using in their
blends systematically Vanadium pentoxide, I would like to know more about
this (expensive) metal oxide, that the authors list as a toxic product. Can
somebody tell me more about the toxicity: as raw material, as glaze, low or
high fired? Many thanks.
Jeff van den Broeck - P.O.Box 1099
Baguio City 2600 - Philippines
jvdb=40skyinet.net
Dave Finkelnburg on thu 2 sep 99
Jeff,
I would add to Dr. Bastarache's excellent notes that you may want to be
especially careful of vanadium pentoxide in its dry form. Use adequate
respiratory protection and clean up any spills. If you use it in a glaze,
the most likely opportunity to be exposed to a harmful quantity is while
handling the dry powder.
V2O5 is mixed 5 to 7% with clay to make a catalyst used in the
production of sulfuric acid, and workers handling the catalyst use similar
precautions.
Dave Finkelnburg
-----Original Message-----
From: Edouard Bastarache
To: CLAYART@LSV.UKY.EDU
Date: Tuesday, August 31, 1999 10:06 AM
Subject: Re: Vanadium pentoxide
----------------------------Original message----------------------------
------------------
Hello Jeff,
Fume is recognized as being generally more toxic than dust because of the
smaller
particle size of fume, which allows more complete penetration to the small
airways of the lungs.
The absorption of V2O5 by inhalation is nearly 100%.
Poison by ingestion, inhalation, and other routes of entry like
intraperitoneal, sub-cutaneous, intrathecal and intravenous.
Human systemic effects by inhalation:
-bronchiolar constriction,
-including asthma,
-cough,
-dyspnea(shortness of breath),
-sputum,
-conjonctiva irritation.
A respiratory irritant;
causes skin pallor, greenish-black tongue, chest pain, dyspnea, palpitation,
lung changes.
When ingested it causes gastrointestinal tract disturbances.
It may also cause a papular skin rash.
An experimental teratogen,
experimental reproductive effects,
mutagenic data.
When heated to decomposition it emits acrid smoke and irritating fumes of
VOx.
The key to answering your question is your level of exposure.
In the "wet state" as in a glaze, its quite less toxic because
you don't breathe in wet glazes.
Fumes coming out of the kiln when firing could be acrid and
irritating as already stated above.
As for wares leaching vanadium compounds, the door is opened
to discussion to everyone, many factors are involved and there is
nothing like testing your glazes to see if they leach vanadium
pentoxide(poison by ingestion), or other vanadium compounds.
A high fire well balanced glaze should be safer than the opposite.
But i don't know the fate of this chemical in the glaze mix when
heated to maturity, so i cannot discuss correctly this leaching
problem.
Later,
Edouard Bastarache M.D.(Occupational & Environmental Medicine)
In "La Belle Province"
edouardb@sorel-tracy.qc.ca
http://www.sorel-tracy.qc.ca/~edouardb/
References:
Dangerous Properties of Industrial Materials by Sax and Lewis.
Chemical Hazards of the Workplace by Proctor and Hughes.
-----Message d'origine-----
De : Jeff van den Broeck
@ : CLAYART@LSV.UKY.EDU
Date : 30 ao{t, 1999 16:54
Objet : Vanadium pentoxide
----------------------------Original message----------------------------
I'm very interested in the opinions of experts about all sorts of health
hazards potters (and their customers) are exposed to.
Recently I read a book that's already available since 1996. The title:The
Potter's Palette by Christine Constant and Steve Ogden. They give some
warnings about risks and health hazards, but as they're using in their
blends systematically Vanadium pentoxide, I would like to know more about
this (expensive) metal oxide, that the authors list as a toxic product. Can
somebody tell me more about the toxicity: as raw material, as glaze, low or
high fired? Many thanks.
Jeff van den Broeck - P.O.Box 1099
Baguio City 2600 - Philippines
jvdb@skyinet.net
Jimmy G on wed 5 sep 01
I'm looking for a source of Vanadium Pentoxide in powdered form. I'd
like to play around with it, but can only find the granular. I'll use
that until I can find the former (Heck,,, I'll probably come up with
something I like).
Any experience out there using either form?
David Hewitt on fri 24 jan 03
I have been experimenting with Vanadium Pentoxide.
One test has been to brush a weak solution onto a biscuit fired
porcelain piece and then spray on a white semi matt glaze and fire to
cone 6.
This gives a remarkable crawling effect and gives a pale blue colour to
the otherwise white glaze.
If, after brushing on the weak solution of Vanadium Pentoxide I wipe off
a much as possible, then I do not get the crawling but the glaze has the
same pale blue colour.
If the Vanadium Pentoxide is applied thickly or left in a groove when
the rest is wiped off, then this comes out as a dark brown to black area
without any glaze.
Has anyone had a similar experience and if so have you any explanation
for the crawling?
--
David Hewitt
David Hewitt Pottery
7 Fairfield Road, Caerleon, Newport,
South Wales, NP18 3DQ.
Tel:- +44 (0) 1633 420647
Fax:- +44 (0) 870 1617274
Web:- http://www.dhpot.demon.co.uk
Brian O'Neill on fri 24 jan 03
David,
I too have been experimenting with Vanadium Pentoxide. I brush it on leatherhard
ware and then brush on a very matte slip over it. Fired to cone 6 I get some very
wonderful bleed through with no crawling. I did try Robert Sperry's crackle slip
(see archives), and that crawled considerably.
I'm in the middle of my tests and will let you know if I discover anything more
substantive. Hopefully the glaze mavens will have more to tell.
Brian
David Hewitt wrote:
> I have been experimenting with Vanadium Pentoxide.
>
> One test has been to brush a weak solution onto a biscuit fired
> porcelain piece and then spray on a white semi matt glaze and fire to
> cone 6.
>
> This gives a remarkable crawling effect and gives a pale blue colour to
> the otherwise white glaze.
>
> If, after brushing on the weak solution of Vanadium Pentoxide I wipe off
> a much as possible, then I do not get the crawling but the glaze has the
> same pale blue colour.
>
> If the Vanadium Pentoxide is applied thickly or left in a groove when
> the rest is wiped off, then this comes out as a dark brown to black area
> without any glaze.
>
> Has anyone had a similar experience and if so have you any explanation
> for the crawling?
> --
> David Hewitt
> David Hewitt Pottery
> 7 Fairfield Road, Caerleon, Newport,
> South Wales, NP18 3DQ.
> Tel:- +44 (0) 1633 420647
> Fax:- +44 (0) 870 1617274
> Web:- http://www.dhpot.demon.co.uk
>
> ______________________________________________________________________________
> 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.
Merrie Boerner on fri 24 jan 03
I use a cone 6 glaze named "Stone matte gray" in electric firings. That
recipe has two ingredients that I normally don't use in my other glazes;
Cornwall Stone and Vanadium Pentoxide. I didn't really know which one caused
the wonderful bleed through until I read your post, David. Thanks for the
info. The vanadium comes with a long print-out of hazards, so I use it with
caution.
I'm interested in following this thread of posts.
Thanks,
Merrie
Brian on sat 25 jan 03
On 24/1/03,David Hewitt...
> have you any explanation
>for the crawling?
David, An not too scientific attempt to describe crawling, beading,
and crackle can be found at
http://www.gartside.info links.....Clayglaze Explore>crackle glazes
not actually related to Vanadium but might interest you
Brian
--
ceramic desigNZ
http://www.gartside.info
Ron Roy on sun 26 jan 03
Vanadium is not without some danger - It is an irritant as dust to eyes,
skin and respitory tract and can cause allergies.
Systemic absorption is much more serious - anemia, kidney disfunction,
gastronomical disorders, nervous system damage and cough.
RR
>I too have been experimenting with Vanadium Pentoxide. I brush it on
>leatherhard
>ware and then brush on a very matte slip over it. Fired to cone 6 I get
>some very
>wonderful bleed through with no crawling. I did try Robert Sperry's
>crackle slip
>(see archives), and that crawled considerably.
>
>I'm in the middle of my tests and will let you know if I discover anything more
>substantive. Hopefully the glaze mavens will have more to tell.
>
>Brian
>
>David Hewitt wrote:
>
>> I have been experimenting with Vanadium Pentoxide.
>>
>> One test has been to brush a weak solution onto a biscuit fired
>> porcelain piece and then spray on a white semi matt glaze and fire to
>> cone 6.
>>
>> This gives a remarkable crawling effect and gives a pale blue colour to
>> the otherwise white glaze.
>>
>> If, after brushing on the weak solution of Vanadium Pentoxide I wipe off
>> a much as possible, then I do not get the crawling but the glaze has the
>> same pale blue colour.
>>
>> If the Vanadium Pentoxide is applied thickly or left in a groove when
>> the rest is wiped off, then this comes out as a dark brown to black area
>> without any glaze.
>>
>> Has anyone had a similar experience and if so have you any explanation
>> for the crawling?
>> --
>> David Hewitt
>> David Hewitt Pottery
>> 7 Fairfield Road, Caerleon, Newport,
>> South Wales, NP18 3DQ.
>> Tel:- +44 (0) 1633 420647
>> Fax:- +44 (0) 870 1617274
>> Web:- http://www.dhpot.demon.co.uk
>>
>>
>>__________________________________________________________________________
>>____
>> 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.
>
>______________________________________________________________________________
>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.
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
David Hewitt on mon 27 jan 03
Having worked in the Chemical industry for 34 years I have learnt to
work safely with much more hazardous materials than Vanadium Pentoxide,
but thank you for your concern.
Because there are some hazards in handling some materials, this is no
reason for not using them if the results are interesting. In the case of
vanadium the results seem to me, so far, to be quite unique and my
initial posting was to find out if others had similar results and, in
the case of crawling, why this should be the case.
I am glad to see that there are some other potters on this trail and I
look forward to hearing of their results.
David
In message , Ron Roy writes
>Vanadium is not without some danger - It is an irritant as dust to eyes,
>skin and respitory tract and can cause allergies.
>
>Systemic absorption is much more serious - anemia, kidney disfunction,
>gastronomical disorders, nervous system damage and cough.
>
>RR
>
>
>>I too have been experimenting with Vanadium Pentoxide. I brush it on
>>leatherhard
>>ware and then brush on a very matte slip over it. Fired to cone 6 I get
>>some very
>>wonderful bleed through with no crawling. I did try Robert Sperry's
>>crackle slip
>>(see archives), and that crawled considerably.
>>
>>I'm in the middle of my tests and will let you know if I discover anything more
>>substantive. Hopefully the glaze mavens will have more to tell.
>>
>>Brian
>>
>>David Hewitt wrote:
>>
>>> I have been experimenting with Vanadium Pentoxide.
>>>
>>> One test has been to brush a weak solution onto a biscuit fired
>>> porcelain piece and then spray on a white semi matt glaze and fire to
>>> cone 6.
>>>
>>> This gives a remarkable crawling effect and gives a pale blue colour to
>>> the otherwise white glaze.
>>>
>>> If, after brushing on the weak solution of Vanadium Pentoxide I wipe off
>>> a much as possible, then I do not get the crawling but the glaze has the
>>> same pale blue colour.
>>>
>>> If the Vanadium Pentoxide is applied thickly or left in a groove when
>>> the rest is wiped off, then this comes out as a dark brown to black area
>>> without any glaze.
>>>
>>> Has anyone had a similar experience and if so have you any explanation
>>> for the crawling?
>>> --
>>> David Hewitt
>>> David Hewitt Pottery
>>> 7 Fairfield Road, Caerleon, Newport,
>>> South Wales, NP18 3DQ.
>>> Tel:- +44 (0) 1633 420647
>>> Fax:- +44 (0) 870 1617274
>>> Web:- http://www.dhpot.demon.co.uk
>>>
>>>
>>>__________________________________________________________________________
>>>____
>>> 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.
>>
>>______________________________________________________________________________
>>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.
>
>Ron Roy
>RR#4
>15084 Little Lake Road
>Brighton, Ontario
>Canada
>K0K 1H0
>Phone: 613-475-9544
>Fax: 613-475-3513
--
David Hewitt
David Hewitt Pottery
7 Fairfield Road, Caerleon, Newport,
South Wales, NP18 3DQ.
Tel:- +44 (0) 1633 420647
Fax:- +44 (0) 870 1617274
Web:- http://www.dhpot.demon.co.uk
Steve Mills on tue 28 jan 03
That is an understatement. The following are directly quoted from the UK
MSDS on Vanadium Pentoxide:
EC Supply Labelling T Toxic Dangerous for the Environment
R-Phrases
R20/22 Harmful by inhalation and if swallowed
R37 Irritating to respiratory system
R40 Possible risk of irreversible effects
R48/23 Toxic: Danger of serious damage to health by
prolonged exposure through inhalation
R51/53 Toxic to aquatic organisms, may cause long term
adverse effects in the aquatic environment.
R63 Possible risk of harm to the unborn child
S-Phrases
S13 keep away from food, drink and animal feeding stuff
S20/21 when using do not eat, drink or smoke
S22/23 do not breathe dust or spray
S36/37 wear suitable protective clothing
S38 In case of insufficient ventilation wear suitable respiratory
equipment
S45 In case of accident or if you feel unwell seek medical advice
immediately (show label where possible).
S61 Avoid release to the environment.
Please use it with care!
Steve
Bath
UK
In message , Ron Roy writes
>Vanadium is not without some danger - It is an irritant as dust to eyes,
>skin and respitory tract and can cause allergies.
>
>Systemic absorption is much more serious - anemia, kidney disfunction,
>gastronomical disorders, nervous system damage and cough.
>
>RR
--
Steve Mills
Bath
UK
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