Lynn Korbel on wed 31 mar 99
Please tell me--Is the following base matt glaze food safe? will fire it at
cone 6 ox.
i'm not sure about the barium????
Nepheline syenite 50
barium carbonate 10
ferro frit #3124 5
Whiting 5
lithium carbonate 5
e.p.k. kaolin 10
Flint 15
I want to test this with added copper, and chrome--but am only interested if
it is food safe. thanking ya'll in advance--
Lynn on a rainy Mississippi day
http://members.aol.com/lynnesque3/lynn.htm
When one tugs at a single thing in nature, he finds it attached to the rest of
the world
--john muir
John Hesselberth on thu 1 apr 99
Hi Lynn,
Unfortunately you have just described a Catch 22 situation. You won't
test it until you know it is safe and you can't know if it is safe until
you test it. Most people forego the use of barium in food contact
surfaces; although some still consider it Ok. I recommend you test your
base glaze for barium and lithium. If that looks Ok to you then test the
copper containing glaze for copper, barium and lithium (copper is known
to loosen up the whole structure and may well make the barium and/or
lithium more extractable than it was without copper present.) John
Lynn Korbel wrote:
>----------------------------Original message----------------------------
>Please tell me--Is the following base matt glaze food safe? will fire it at
>cone 6 ox.
>i'm not sure about the barium????
>Nepheline syenite 50
>barium carbonate 10
>ferro frit #3124 5
>Whiting 5
>lithium carbonate 5
>e.p.k. kaolin 10
>Flint 15
>I want to test this with added copper, and chrome--but am only interested if
>it is food safe. thanking ya'll in advance--
>Lynn on a rainy Mississippi day
>http://members.aol.com/lynnesque3/lynn.htm
>
>When one tugs at a single thing in nature, he finds it attached to the
>rest of
>the world
>--john muir
John Hesselberth
Frog Pond Pottery
P.O. Box 88
Pocopson, PA 19366 USA
EMail: john@frogpondpottery.com web site: http://www.frogpondpottery.com
"It is time for potters to claim their proper field. Pottery in its pure
form relies neither on sculptural additions nor on pictorial decorations.
but on the counterpoint of form, design, colour, texture and the quality
of the material, all directed to a function." Michael Cardew in "Pioneer
Pottery"
Ron Roy on mon 5 apr 99
Hi Lynn,
I'll bet it's not - and adding copper and chrome is going to make it worse.
Barium and Lithium are both toxic - find another glaze.
RR
>----------------------------Original message----------------------------
>Please tell me--Is the following base matt glaze food safe? will fire it at
>cone 6 ox.
>i'm not sure about the barium????
>Nepheline syenite 50
>barium carbonate 10
>ferro frit #3124 5
>Whiting 5
>lithium carbonate 5
>e.p.k. kaolin 10
>Flint 15
>I want to test this with added copper, and chrome--but am only interested if
>it is food safe. thanking ya'll in advance--
>Lynn on a rainy Mississippi day
>http://members.aol.com/lynnesque3/lynn.htm
>
>When one tugs at a single thing in nature, he finds it attached to the rest of
>the world
>--john muir
Ron Roy
93 Pegasus Trail
Scarborough, Ontario
Canada M1G 3N8
Tel: 416-439-2621
Fax: 416-438-7849
Web page: http://digitalfire.com/education/people/ronroy.htm
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