Antoinette Badenhorst on sun 18 may 03
Can the glaze gurus please tell me how stable is the use of nickel in
glazes? I know that it is toxic, but would like to know how toxic? I
learned that one should handle it careful when mixing into glazes. How
does it compare to the use of the carbonate?
Thanks.
Antoinette
Alan Walker on mon 19 may 03
> Can the glaze gurus please tell me how stable is the use of nickel in
> glazes? I know that it is toxic, but would like to know how toxic? I
> learned that one should handle it careful when mixing into glazes. How
> does it compare to the use of the carbonate?
BE CAREFUL
See, for example http://physchem.ox.ac.uk/MSDS/NI/nickel_II_oxide.html and
http://www.visualarts.net.au/pa/ceramics.pdf
Ron Roy on wed 21 may 03
Hi Antoinette,
You are right - there are toxicity issues with nickel.
The question should be - should I only use nickel with a stable glaze where
that glaze comes in contact with food - and the answer should be yes.
There is no law about this - just a question of good craftmanship.
RR
>Can the glaze gurus please tell me how stable is the use of nickel in
>glazes? I know that it is toxic, but would like to know how toxic? I
>learned that one should handle it careful when mixing into glazes. How
>does it compare to the use of the carbonate?
>Thanks.
>Antoinette
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Antoinette Badenhorst on wed 21 may 03
Thanks Ron, I also read somewhere that nickel is very refractory.
Boiling point 2700+C.I do fire to ^10, but still for the refractory
reason I will be very careful not to use it in a glaze for food. I can
not test every piece of pottery that comes from my kiln.(like most of us
can not do) I am in the process of adjusting a recipe and just learned
that nickel settles quickly. That makes me think to rather use the
carbonate than the oxide.
As always....shooting in the dark with glazes.
Antoinette Badenhorst
105 Westwood Circle
Saltillo MS
38866
662 869 1651
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Ron Roy
Sent: Wednesday, May 21, 2003 1:37 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: Nickel oxide
Hi Antoinette,
You are right - there are toxicity issues with nickel.
The question should be - should I only use nickel with a stable glaze
where
that glaze comes in contact with food - and the answer should be yes.
There is no law about this - just a question of good craftmanship.
RR
>Can the glaze gurus please tell me how stable is the use of nickel in
>glazes? I know that it is toxic, but would like to know how toxic? I
>learned that one should handle it careful when mixing into glazes. How
>does it compare to the use of the carbonate?
>Thanks.
>Antoinette
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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Ron Roy on thu 22 may 03
Yes - it is my experience that nickel is not a flux at our temperatures -
if you use more than a little you may have to add more melter to some
glazes.
You don't have to test every piece by the way - once you have tested a
glaze - to see if is stable you can be pretty sure it will stay that way if
fired the same way and there are no wild swings in your materials - another
reason to choose materials that have a track record.
Most potters would choose carbonates I would guess - the finer particles
disburse better in glazes - but it also means you need to pay more
attention (the particles float better in the air) to what you are
breathing.
RR
>Thanks Ron, I also read somewhere that nickel is very refractory.
>Boiling point 2700+C.I do fire to ^10, but still for the refractory
>reason I will be very careful not to use it in a glaze for food. I can
>not test every piece of pottery that comes from my kiln.(like most of us
>can not do) I am in the process of adjusting a recipe and just learned
>that nickel settles quickly. That makes me think to rather use the
>carbonate than the oxide.
>As always....shooting in the dark with glazes.
>Antoinette Badenhorst
>105 Westwood Circle
>Saltillo MS
>38866
>662 869 1651
>
>
>-----Original Message-----
>From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Ron Roy
>Sent: Wednesday, May 21, 2003 1:37 AM
>To: CLAYART@LSV.CERAMICS.ORG
>Subject: Re: Nickel oxide
>
>Hi Antoinette,
>
>You are right - there are toxicity issues with nickel.
>
>The question should be - should I only use nickel with a stable glaze
>where
>that glaze comes in contact with food - and the answer should be yes.
>
>There is no law about this - just a question of good craftmanship.
>
>RR
>
>>Can the glaze gurus please tell me how stable is the use of nickel in
>>glazes? I know that it is toxic, but would like to know how toxic? I
>>learned that one should handle it careful when mixing into glazes. How
>>does it compare to the use of the carbonate?
>>Thanks.
>>Antoinette
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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