Nanci Mansfield on sat 25 mar 06
I found a recipe for cone 6 nutmeg that I really like the look of. I didn't find any comment as to the use of this glaze on the inside of mugs, etc. Can anyone tell me if its safe to use, marks or heats up in a mictowave?
Thanks
Nanci Mansfield
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William & Susan Schran User on sat 25 mar 06
On 3/25/06 10:54 AM, "Nanci Mansfield" wrote:
> I found a recipe for cone 6 nutmeg that I really like the look of. I didn't
> find any comment as to the use of this glaze on the inside of mugs, etc.
Do a search in the archives, there was lots of discussion some time back
about the nutmeg glaze.
There was also a discussion about the glaze in Pottery Making Illustrated
some time back.
My interpretation of the glaze was included in the article and Ron Roy added
to good information about making the glaze more durable.
-- William "Bill" Schran
Fredericksburg, Virginia
wschran@cox.net
wschran@nvcc.edu
John Hesselberth on sun 26 mar 06
On Mar 25, 2006, at 10:54 AM, Nanci Mansfield wrote:
> I found a recipe for cone 6 nutmeg that I really like the look of.
> I didn't find any comment as to the use of this glaze on the inside
> of mugs, etc. Can anyone tell me if its safe to use, marks or heats
> up in a mictowave?
> Thanks
> Nanci Mansfield
Hi Nanci,
I am a little suspicious this is in the category of an "unmelted
matte" and, therefore, not very stable. It has enough silica and
alumina to be stable and there is nothing in it to be particularly
concerned about from a leaching standpoint. But it has a lot of
magnesium and almost no boron so I doubt it is fully melted at cone
6. It is more like a cone 9 or 10 glaze. Unmelted mattes are a very
poor way to get a matte surface if you want a stable or durable
glaze. You might vinegar test it and see what happens. I personally
would not use it on dinnerware--not for safety reasons, but because I
don't think it will hold up in use. But only testing will tell for sure.
Regards,
John
lee love on sun 26 mar 06
--- In clayart@yahoogroups.com, John Hesselberth wrote:
>
> I am a little suspicious this is in the category of an "unmelted
> matte"
Actually, doesn't look very matte:
http://www.ricks-bricks.com/images/woodorelectric.jpg
Also. Didn't the original CM article mention using this glaze
layered with another glaze? That would have some effect upon its
chemistry.
Google isn't popping up with the recipes very readily... Gotta walk
Taiko...
--
Lee In Mashiko, Japan
http://mashiko.org
http://seisokuro.blogspot.com/
"On the internet, nobody knows you are a dog."
mtigges@NOSPAM.SHAW.CA on sun 26 mar 06
On Sun, Mar 26, 2006 at 07:41:05AM -0500, John Hesselberth wrote:
> On Mar 25, 2006, at 10:54 AM, Nanci Mansfield wrote:
>
> >I found a recipe for cone 6 nutmeg that I really like the look of.
> >I didn't find any comment as to the use of this glaze on the inside
> >of mugs, etc. Can anyone tell me if its safe to use, marks or heats
> >up in a mictowave?
> > Thanks
> > Nanci Mansfield
>
> Hi Nanci,
>
> I am a little suspicious this is in the category of an "unmelted
> matte" and, therefore, not very stable. It has enough silica and
> alumina to be stable and there is nothing in it to be particularly
> concerned about from a leaching standpoint. But it has a lot of
> magnesium and almost no boron so I doubt it is fully melted at cone
> 6. It is more like a cone 9 or 10 glaze. Unmelted mattes are a very
> poor way to get a matte surface if you want a stable or durable
> glaze. You might vinegar test it and see what happens. I personally
> would not use it on dinnerware--not for safety reasons, but because I
> don't think it will hold up in use. But only testing will tell for sure.
>
John,
I should probably read your book more closely and answer the question
myself, but your comments made me wonder. I use nutmeg in a 3:1 ratio
with the white matte that was in the same article. Is it still an
unmelted glaze at cone 6?
You can see my use of this glaze in the mug exchange gallery at
potteryforms.org. I love it, I think it looks really great on my
reclaimed clay which is a mixture of B-Mix and Calico.
Mark.
John Hesselberth on sun 26 mar 06
On Mar 26, 2006, at 10:40 AM, mtigges@NOSPAM.SHAW.CA wrote:
> I should probably read your book more closely and answer the question
> myself, but your comments made me wonder. I use nutmeg in a 3:1 ratio
> with the white matte that was in the same article. Is it still an
> unmelted glaze at cone 6?
Hi Mark,
If you are referring to Waxy White, it is a somewhat more durable
glaze. It is still lower in silica than I like to see, but it is
fluxed with zinc and and good level of alkalis and calcium--magnesium
is fairly low. It should melt fairly well. How would the two behave
when mixed or layered? Probably better that Nutmeg by itself, but it
is hard to predict. Vinegar test your combination for 3 days--if
there is no change in sheen or color I wouldn't worry too much about
it since there is nothing in either glaze that is a particular concern.
Regards,
John
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