Paul Kirwin on wed 13 dec 00
Does anyone know if a low fire glaze (Cone 06-03) that is 10% lithium =
carbonate would be food safe? I have gotten conflicting advise, and =
would love to get some more. I know that I will porbably need to get it =
tested at a lab, but if I can save the expense if it definitely is not =
food safe, then I won't even bother.=20
thanks. Barbara in Connecticut. Email address =
Paul.Kirwin@worldnet.att.net
Khaimraj Seepersad on thu 14 dec 00
Hello to All ,
Barbara ,
I stay clear of Lithium anything , because of what I read in the
Pharmacopoeia .
[ Always read the Martin Dale for Oxide effects e.g Ca0 , Sr0 ]
Replaces - sodium in the body's functions , when you notice
the symptoms of poisoning , it is usually too late . Therapy is
with potassium oxide .
Lithium oxide is easily leached out of glass with hot water ,
and is available as a trace component in foods and liquids.
[ I believe it can be toxic at the mg stage ]
The healthy body handles 1 gram easily on a daily basis .
[ What is a healthy body ? ] . People on lithium treatment are
always at a risk .
That said , I am sure testing glazes at Alfred's would save you
much grief.
Why not master a good Low Borate Multimetal Glaze , high in
Silica , for better , safer results , you could work with 3124 or
3134 ?
Khaimraj
-----Original Message-----
From: Paul Kirwin
To: CLAYART@LSV.CERAMICS.ORG
Date: 14 December 2000 4:50
Subject: lithium in glazes
Does anyone know if a low fire glaze (Cone 06-03) that is 10% lithium
carbonate would be food safe? I have gotten conflicting advise, and would
love to get some more. I know that I will porbably need to get it tested at
a lab, but if I can save the expense if it definitely is not food safe, then
I won't even bother.
thanks. Barbara in Connecticut. Email address
Paul.Kirwin@worldnet.att.net
x
Ron Roy on mon 18 dec 00
I would not think that would normally be the case. It's much more difficult
to make stable glazes at those lower temperatures - easier at higher temps
because stability is linked to silica and alumina - both refractories - the
higher you fire to the more of them you can get in a glaze.
This does not mean it's automatic - most of the glazes we are using are not
stable - especially when we start dumping in other materials that can
degrade the durability of a glaze - like copper for instance.
As for the toxicity issue - just to piggy back on what Monona said.
Toxicity is - or at least should be linked to body weight. What may be non
toxic to an adult may be toxic to a breast feeding baby - or a fetus. How
much lithium can a one pound fetus absorb before there is an effect? No
answer will be forthcoming because no one knows. This does not mean there
is no effect - it simply means no one has done the experiments.
Not convinced - how much lithium can a one ounce fetus and on and on.
If we get into the numbers game - we then also have to start giving amounts
- and if you have been paying attention the allowable limits keep going
down - not up. Ever wondered about that?
RR
>Does anyone know if a low fire glaze (Cone 06-03) that is 10% lithium
>carbonate would be food safe? I have gotten conflicting advise, and would
>love to get some more. I know that I will porbably need to get it tested
>at a lab, but if I can save the expense if it definitely is not food safe,
>then I won't even bother.
>thanks. Barbara in Connecticut. Email address Paul.Kirwin@worldnet.att.net
Ron Roy
93 Pegasus Trail
Scarborough
Ontario, Canada
M1G 3N8
Evenings 416-439-2621
Fax 416-438-7849
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