Liz Gowen on tue 29 apr 03
Gail I use a rock tumbler for some clay I dig from the driveway. I use it to
coat stoneware with and it burnishes well. It had been a bit coarse prior
to putting through the tumbler even though I sieved out the sand I believe
in an 80 mesh screen.
I am curious as to you choice of barnard slip. If the coloring is that
right for you that you are willing to take the precautions the manganese in
it requires, both in the fine grinding and firing then so be it. Otherwise I
would choose say red art .You don't mention the type of firing to be used or
the effect you want from this clay.
Liz Gowen
> Gail Dapogny said
> Having just played around with making a terra sig and NOT successfully
> getting it to a burnishable stage, I 'm wondering (in my current
frustrated
> frame of mind) if a stone polishing machine could produce a burnishable
> terra sig type slip.... (I.E. since I can't afford a ball mill!)
>
> Any thoughts? Or any help on the terra sig? I was trying to make one out
> of Barnard slip.
>
Gail Dapogny on tue 29 apr 03
Hi and thanks to Marcia, Liz, Paul, and Roger for your responses:
I'm looking for a dark brown slip or dark brown glaze appropriate for
greenware (even though it will be both bisque-fired and gas-reduction fired
to cone 9-10). I saw something with Barnard slip on it and liked the
color; didn't know anything about its components. I'm a little wiser now,
thanks to you guys! Perhaps I should go with Redart and just add some
brown Mason stain? Everytime I try to get brown, I end up with black.
Theoretically speaking, would a rock tumbler enable a terra sig to yield
more useable stuff?
Thanks, Gail Dapogny in Ann Arbor
>Gail I use a rock tumbler for some clay I dig from the driveway. ...
> I am curious as to you choice of barnard slip. If the coloring is that
>right for you that you are willing to take the precautions the manganese in
>it requires, both in the fine grinding and firing then so be it. Otherwise I
>would choose say red art .You don't mention the type of firing to be used or
>the effect you want from this clay.
> Liz Gowen
>
>
>> Gail Dapogny said
>> Having just played around with making a terra sig and NOT successfully
>> getting it to a burnishable stage, I 'm wondering (in my current
>frustrated
>> frame of mind) if a stone polishing machine could produce a burnishable
>> terra sig type slip.... (I.E. since I can't afford a ball mill!)
>>
>> Any thoughts? Or any help on the terra sig? I was trying to make one out
>> of Barnard slip.
Dewitt Gimblet on tue 29 apr 03
At 12:54 PM 4/29/2003 -0400, you wrote:
>Theoretically speaking, would a rock tumbler enable a terra sig to yield
>more useable stuff?
When I was at a Pete Pinnell workshop a couple years back, he recommended
against ball milling before the terra sig settling / separation
process. He said there is always some non-clay particles in the
clay. Normally, these settle out fairly quickly, but not if you ball mill
the mix first. These non-clay particles will reduce quality of the
resulting terra sig.
deg
Marcia Selsor on tue 29 apr 03
I have made terra sig using a ball mill and by following the Kenny
process. He says the clear strata is what is really terra sig. Others
disagree and say the middle layer is the TS. .
I use the middle layer first and then finish with the clear level. Then
I burnish. I have some beautiful surfaces.
Marcia
Dewitt Gimblet wrote:
> At 12:54 PM 4/29/2003 -0400, you wrote:
>
>> Theoretically speaking, would a rock tumbler enable a terra sig to yield
>> more useable stuff?
>
>
> When I was at a Pete Pinnell workshop a couple years back, he recommended
> against ball milling before the terra sig settling / separation
> process. He said there is always some non-clay particles in the
> clay. Normally, these settle out fairly quickly, but not if you ball mill
> the mix first. These non-clay particles will reduce quality of the
> resulting terra sig.
>
> deg
>
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--
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Vince Pitelka on tue 29 apr 03
> When I was at a Pete Pinnell workshop a couple years back, he recommended
> against ball milling before the terra sig settling / separation
> process. He said there is always some non-clay particles in the
> clay. Normally, these settle out fairly quickly, but not if you ball mill
> the mix first. These non-clay particles will reduce quality of the
> resulting terra sig.
Deg -
That is an interesting theory, and I certainly trust Pete's judgement, but
with some coarse clays, the only way you will get a terra sig is to ball
mill the clay before settling. Almost all the non-clay particles will still
settle out, so you should still get a good terra sig and a good shine.
Best wishes -
- Vince
Vince Pitelka
Appalachian Center for Craft
Tennessee Technological University
1560 Craft Center Drive, Smithville TN 37166
Home - vpitelka@dtccom.net
615/597-5376
Office - wpitelka@tntech.edu
615/597-6801 x111, FAX 615/597-6803
http://iweb.tntech.edu/wpitelka/
karen gringhuis on wed 30 apr 03
Gail
I recently made a successful TS out of grolleg using
the method from Cushing's HANDBOOK with Darvan and no
ball mill. Def. "successful" - put on bone dry
porcelain greenware with a brush then burnished with a
polishing stone, I definitely got a shine. How it
will look fired to C/9-10 I don't know yet. Am doing
same test w/ EPK. Both could surely be colored - have
never done this so don't know about colored shine. I
was instructed to throw out the clear water which
rises to the top as well as about the first 1/4" of
the TS layer. (I saved this layer - don't ask me why.)
=====
Karen Gringhuis
KG Pottery
Box 607 Alfred NY 14802
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Vince Pitelka on fri 2 may 03
> I recently made a successful TS out of grolleg using
> the method from Cushing's HANDBOOK with Darvan and no
> ball mill. Def. "successful" - put on bone dry
> porcelain greenware with a brush then burnished with a
> polishing stone., I definitely got a shine.
Karen -
But will it polish to a high shine when rubbed with a piece of chamois, soft
cloth, or grocer bag plastic? That is the test of a good terra sig. The
fact that it will give a shine when burnished with a shiny stone is no
indication at all, because almost ANY clay will burnish to a high shine.
The distinctive property of a good terra sig is uniformly ultra-fine
platelet size, which allows polishing to a high shine by rubbing with a soft
material rather than burnishing with a hard object.
Best wishes -
- Vince
Vince Pitelka
Appalachian Center for Craft
Tennessee Technological University
1560 Craft Center Drive, Smithville TN 37166
Home - vpitelka@dtccom.net
615/597-5376
Office - wpitelka@tntech.edu
615/597-6801 x111, FAX 615/597-6803
http://iweb.tntech.edu/wpitelka/
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