David Beumee on tue 29 apr 03
Now don't I feel silly. But, is there a time when grolleg would be preferred
>over EPK?
Yes there is. If you were hounding the trail of blue celedon glazes, you would
use Grolleg for the clay content of your glaze and in your porcelain clay body.
The higher titanium content of domestic kaolins turns celedons to a greenish tint.
Otherwise, EPK fires to a very white color in reduction at cone 10
and is excellent for use where kaolin content is called for in the glaze recipe.
David Beumee
4/29/03 12:15:21 PM, Carole Fox wrote:
>David-
>Thanks for the enlightening info that comes just in time for me to get one
>more glaze test into this next kiln load. I have always wanted to know
>exactly what grolleg was, but it was never listed in any of my books. I
>bought some years ago for making slips. I had asked my supplier for china
>clay and he asked if he could sub the grolleg. "Sure!" said this newbie
>glaze maker, because he assured me it would work in my slip recipe- but I
>never did ask what it was and have never come across a recipe using it.
>
>?
>Carole Fox
>Elkton, MD
>thesilverfox@dol.net
>----- Original Message -----
>From: "David Beumee"
>To:
>Sent: Tuesday, April 29, 2003 10:56 AM
>Subject: Re: china clay sub
>
>
>> >Can I substitute grolleg for china clay in a glaze recipe ?
>>
>> Hi Carole,
>> Grolleg is china clay. Another name for china clay is kaolin.
>> EPK is a domestic kaolin or china clay (mined in the U.S.)
>>
>> David Beumee
>>
>>
>>
>>
>>
>>
>>
>> 4/29/03 7:14:05 AM, Carole Fox wrote:
>>
>> >A little question...
>> ? This is the cone
>> >6 transparent glossy glaze (T13) in Michael Bailey's book. The china clay
>is
>> >only 5% of the recipe.
>> >Thanks.
>> >Carole Fox
>> >Elkton, MD
>> >thesilverfox@dol.net
>> >
>>
>>___________________________________________________________________________
>___
>> >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.
>> >
>>
>>
>____________________________________________________________________________
>__
>> 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.
>
>______________________________________________________________________________
>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/
>
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>
Carole Fox on tue 29 apr 03
A little question...
Can I substitute grolleg for china clay in a glaze recipe? This is the cone
6 transparent glossy glaze (T13) in Michael Bailey's book. The china clay is
only 5% of the recipe.
Thanks.
Carole Fox
Elkton, MD
thesilverfox@dol.net
David Beumee on tue 29 apr 03
>Can I substitute grolleg for china clay in a glaze recipe ?
Hi Carole,
Grolleg is china clay. Another name for china clay is kaolin.
EPK is a domestic kaolin or china clay (mined in the U.S.)
David Beumee
4/29/03 7:14:05 AM, Carole Fox wrote:
>A little question...
? This is the cone
>6 transparent glossy glaze (T13) in Michael Bailey's book. The china clay is
>only 5% of the recipe.
>Thanks.
>Carole Fox
>Elkton, MD
>thesilverfox@dol.net
>
>______________________________________________________________________________
>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.
>
Carole Fox on tue 29 apr 03
David-
Thanks for the enlightening info that comes just in time for me to get one
more glaze test into this next kiln load. I have always wanted to know
exactly what grolleg was, but it was never listed in any of my books. I
bought some years ago for making slips. I had asked my supplier for china
clay and he asked if he could sub the grolleg. "Sure!" said this newbie
glaze maker, because he assured me it would work in my slip recipe- but I
never did ask what it was and have never come across a recipe using it.
Now don't I feel silly. But, is there a time when grolleg would be preferred
over EPK?
Carole Fox
Elkton, MD
thesilverfox@dol.net
----- Original Message -----
From: "David Beumee"
To:
Sent: Tuesday, April 29, 2003 10:56 AM
Subject: Re: china clay sub
> >Can I substitute grolleg for china clay in a glaze recipe ?
>
> Hi Carole,
> Grolleg is china clay. Another name for china clay is kaolin.
> EPK is a domestic kaolin or china clay (mined in the U.S.)
>
> David Beumee
>
>
>
>
>
>
>
> 4/29/03 7:14:05 AM, Carole Fox wrote:
>
> >A little question...
> ? This is the cone
> >6 transparent glossy glaze (T13) in Michael Bailey's book. The china clay
is
> >only 5% of the recipe.
> >Thanks.
> >Carole Fox
> >Elkton, MD
> >thesilverfox@dol.net
> >
>
>___________________________________________________________________________
___
> >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.
> >
>
>
____________________________________________________________________________
__
> 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.
Tony Hansen on tue 29 apr 03
Check:
http://digitalfire.ab.ca/cermat/ceramicmaterials/material.php?goto=grolleg
> A little question...
> Can I substitute grolleg for china clay in a glaze recipe? This is the cone
> 6 transparent glossy glaze (T13) in Michael Bailey\'s book. The china clay is
> only 5% of the recipe.
> Thanks.
========
Tony Hansen
Craig Martell on wed 30 apr 03
David B sez:
>If you were hounding the trail of blue celedon glazes, you would
>use Grolleg for the clay content of your glaze and in your porcelain clay
>body.
>The higher titanium content of domestic kaolins turns celedons to a
>greenish tint.
>Otherwise, EPK fires to a very white color in reduction at cone 10
>and is excellent for use where kaolin content is called for in the glaze
>recipe.
Hello David and others searching for good kaolins and their best use:
Grolleg works very well for blue celadons with regard to both body and
glaze but it's not a very good suspender so you need to use some sort of
montmorillonite material such as macaloid or vee gum cer or "t". I avoid
bentonite in these sorts of situations. A pinch or MgSO4 helps too.(epsom
salts)
As far as US kaolins, EPK is the best one for any kind of glaze and
especially blue celadon if you need to add any clay at all. Most US
kaolins have about 1.4% titanium. I think MacNamee has 1.2% or so but it's
still too much for some glazes. EPK has the lowest with 0.37%. EPK is a
great suspender too. It's a good kaolin to use in most glazes, as you say
above.
I've been working on several porcelain bodies lately and the best one for
the blue celadons contained only ECC Standard Porcelain for the china clay
content. In fact, it was the only clay in the body. Threw very well
too. The best throwing body I've done, so far, contained ECC Standard,
EPK, and Kaopaque 20. The particle size breakup ot the three different
kaolins made the body very workable. The color with the blue celadons was
good, but not as pristine with this body and the best was still just
straight ECC Standard. So it goes!! :>)
True primary kaolins, low in Fe and TiO2 are a very rare occurence,
geologically speaking. Just about all US Kaolins are secondary Kaolins
which accounts for more Fe and TiO2. We still have to get our purest
kaolins from Cornwall.
later on, Craig Martell Hopewell, Oregon
Lily Krakowski on wed 30 apr 03
Yes. Fournier tell us that China clay= kaolin, Fraser speaks of China clay
"or kaolin as it is commonly called". Grolleg is a particular china clay.
It has never made a difference in my (c.6 ox.) glazes.
Carole Fox writes:
> A little question...
> Can I substitute grolleg for china clay in a glaze recipe? This is the cone
> 6 transparent glossy glaze (T13) in Michael Bailey's book. The china clay is
> only 5% of the recipe.
> Thanks.
> Carole Fox
> Elkton, MD
> thesilverfox@dol.net
>
> ______________________________________________________________________________
> 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.
Lili Krakowski
P.O. Box #1
Constableville, N.Y.
(315) 942-5916/ 397-2389
Be of good courage....
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