BBC on sun 26 apr 98
Help=21=21=21 I was told by a ceramic chemist that Gertsley Borate could =
possibly
leach Boron and be harmful. Could someone explain if this is true. GB is =
used in
so many glazes, I cant find one that does not have it if there is a problem.=
And
is there also a problem with Cobalt Oxide leaching also? This has got me
confused and Id really appreciate it if someone would help
Thanks
Glo
boxerdog=40bright.net
Mocha on sat 26 feb 00
Hello all!
My questions are:
1. Is majolica food safe?
-and-
2. How do you know a glaze is food safe? Is it just through years of glazing an
knowledge of chemicals? Or do you give a mug to someone and just wait to see if
they keel over or swell up or not?
Any replies are welcome, and I thank you in advance!
Mocha
Paul Lewing on fri 9 nov 01
on 11/9/01 6:40 PM, Liz Emery at yoee@AOL.COM wrote:
> What books will tell me about the unsafe ingredients, what makes some
> glazes unsafe for food, and how to create food-safe glazes.
Liz, the newest books will likely have the most information of food-safe, or
stable, durable glazes. Most of the older books never mentioned it at all.
It's only in the last five years or so (due, I think, in large part to
Clayart) that books and magazines have started to address the issue at all.
Hamer & Hamer's dictionary addresses it some if you know where to look.
Harry Fraser's "Glazes for the Craft Potter" was the only book around for a
long time that addressed it at all, and I'm sure the new edition does an
even better job. Michael Bailey's "Glazes, Cone 6" has good information on
that. I think Robin Hopper's rewrite of Daniel Rhodes' "Clay & Glazes for
the Potter" has a chapter on it.
But I'd bet that the definitive text will be the one we all expect soon from
John Hesselberth and Ron Roy. If past performance is any indicator of
future results, it will be an instant classic.
Paul Lewing, Seattle
Liz Emery on fri 9 nov 01
I'm pretty much just starting. I make functional ware and want to know more
about food safe glazes for cone 6 and cone 10 (though mostly cone 6 at the
moment). I am working on making my own glazes.
What books will tell me about the unsafe ingredients, what makes some
glazes unsafe for food, and how to create food-safe glazes.
Liz
John Hesselberth on sat 10 nov 01
on 11/9/01 9:40 PM, Liz Emery at yoee@AOL.COM wrote:
> I'm pretty much just starting. I make functional ware and want to know more
> about food safe glazes for cone 6 and cone 10 (though mostly cone 6 at the
> moment). I am working on making my own glazes.
>
> What books will tell me about the unsafe ingredients, what makes some
> glazes unsafe for food, and how to create food-safe glazes.
Hi Liz,
You could go to my web site and look through the material on glaze
stability. I have collected there a lot of what is known.
Regards,
John
Web site: http://www.frogpondpottery.com Email: john@frogpondpottery.com
"The life so short, the craft so long to learn." Chaucer's translation of
Hippocrates, 5th cent. B.C.
| |
|
