Puddy & Co. on thu 19 oct 00
Hallo, dear group!
Speaking of liner glazes - I just received an order for small wine
glasses, with glaze on the lip but UNGLAZED inside. According to the
customer contact with raw clay enhances the taste of wine. I have heard
of wine glasses made of unglazed terracota - and I am not sure how this
works in terms of staining and seepage. My wine glasses though would be
made of speckled stoneware, fired to ^6 or 7. Speckles are Manganese
Oxide and I am concerned with food ( drink) safety. Does anyone know
about any adverse reaction of those unglazed speckles with food or , in
this case, alcohol? Has anyone heard about improvement of the taste of
wine when served in an unglazed vessel? I will switch to a different
clay, if necessary, but I like to know what I am doing.
Thank you in advance
Hanna Lewandowski
in Southern Ontario, drinking her own meads in ordinary mugs.
Cindy Strnad on fri 20 oct 00
I'd think wine glasses you can't get as clean as possible would be less than
appealing. Wine is not tea.
However, if you want to make wine glasses which will remain unglazed, and
you're worried about the manganese in your clay, then buy some clay without
manganese. You could go the testing route and all, but this does look to me
like the easiest solution. If you want speckles, add some crude iron oxide.
Cindy Strnad
Earthen Vessels Pottery
RR 1, Box 51
Custer, SD 57730
USA
earthenv@gwtc.net
http://www.earthenvesselssd.com
John Baymore on fri 20 oct 00
Speckles are Manganese Oxide and I am concerned with food ( drink) safety=
..
Does anyone know
about any adverse reaction of those unglazed speckles with food or , in
this case, alcohol?
Make an unglazed test cup out of your clay and send it off for leach
testing for Mn. It'll only cost you about $20-30 plus shipping. Then
you'll at least know a "real world number" you can compare to drinking
water standards.
Best,
....................john
John Baymore
River Bend Pottery
22 Riverbend Way
Wilton, NH 03086 USA
603-654-2752 (s)
800-900-1110 (s)
JBaymore@compuserve.com
John.Baymore@GSD-CO.com
"DATES SET: Earth, Water, and Fire Noborigama Woodfiring Workshop =
August 17-26, 2001"
dean warsing on fri 20 oct 00
i have seen WW2 french wine decanters that were lined in
porcelain.......good question?
At 07:47 PM 10/19/2000 -0400, you wrote:
>Hallo, dear group!
>
>Speaking of liner glazes - I just received an order for small wine
>glasses, with glaze on the lip but UNGLAZED inside. According to the
>customer contact with raw clay enhances the taste of wine. I have heard
>of wine glasses made of unglazed terracota - and I am not sure how this
>works in terms of staining and seepage. My wine glasses though would be
>made of speckled stoneware, fired to ^6 or 7. Speckles are Manganese
>Oxide and I am concerned with food ( drink) safety. Does anyone know
>about any adverse reaction of those unglazed speckles with food or , in
>this case, alcohol? Has anyone heard about improvement of the taste of
>wine when served in an unglazed vessel? I will switch to a different
>clay, if necessary, but I like to know what I am doing.
>
>Thank you in advance
>
>Hanna Lewandowski
>in Southern Ontario, drinking her own meads in ordinary mugs.
>
>______________________________________________________________________________
>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.
BobWicks@AOL.COM on fri 20 oct 00
In a message dated 10/20/00 1:07:48 AM Eastern Daylight Time,
paul@THINKERS.ORG writes:
<< Has anyone heard about improvement of the taste of
wine when served in an unglazed vessel? >>
Hanna:
I would be concerned about the safety factor and liability for you especially
if you are using clay with manganese. Manganese causes nerve damage. Now in
Japan they do not glaze the insides of their tea pots as they claim it adds
to the flavor. If I were you I would get in touch with Monona Rossell on the
net and see what she has to offer. Good luck.
Bob
Earl Brunner on fri 20 oct 00
I have seen so much written on manganese, most of it scary
and alarming.
I have seen little in the way of documentation.
I have heard that it is dangerous to breath the fumes or
dust.
On the other hand I have heard that drinking water
contaminated by manganese isn't necessarily harmful.
I have seen people assume that since apparently manganese is
harmful or dangerous in the studio, (dust and fumes) that
naturally it is harmful in/on the finished product. (this
is an assumption, not a fact)
If in fact, the fumes and the dust are what is harmful to us
and in the finished glaze it is not a problem, then why are
we worrying about leach testing for it?
John Baymore wrote:
>
>
> Speckles are Manganese Oxide and I am concerned with food ( drink) safety.
> Does anyone know
> about any adverse reaction of those unglazed speckles with food or , in
> this case, alcohol?
>
>
> Make an unglazed test cup out of your clay and send it off for leach
> testing for Mn. It'll only cost you about $20-30 plus shipping. Then
> you'll at least know a "real world number" you can compare to drinking
> water standards.
>
> Best,
>
> ...................john
>
> John Baymore
> River Bend Pottery
> 22 Riverbend Way
> Wilton, NH 03086 USA
>
> 603-654-2752 (s)
> 800-900-1110 (s)
>
> JBaymore@compuserve.com
> John.Baymore@GSD-CO.com
>
> "DATES SET: Earth, Water, and Fire Noborigama Woodfiring Workshop
> August 17-26, 2001"
>
> ______________________________________________________________________________
> 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.
--
Earl Brunner
http://coyote.accessnv.com/bruec
mailto:bruec@anv.net
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