Gail Dapogny on mon 28 apr 03
Marcia's answer brought a question to my mind. Some time ago, mel
mentioned picking up a stone polishing machine -- child's perhaps -- at a
garage sale, and using it to further grind cobalt oxide.
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 yet another fresh beautiful day in Ann Arbor.
>Balls can grind unpleasantly gritty glazes as well as make terra
>sigilatta which is traditionally milled for 24 hours and let to stand
>for another 24 hours before one separates the stratta. It is a grinding
>machine. Some use it to grind their celedons so there will be no
>spotting. Lots of uses.
>Best regards,
>marcia
Paul Herman on tue 29 apr 03
Hello Gail,
I'm not a Terra Sigillata user but do have a couple of thoughts.
I tried to use Barnard Clay as a slip under glazes and found it to be
non-plastic and not very sticky. It flaked of whether it was put on
damp, dry or bisque ware. It behaves like a clay with large particle
size, and might not be a good one for Terra Sig. I can't find the
analysis now, but remember that it is basically a Kaolin with some
Silica, plus Iron and Manganese.
Vince, have you experimented with Barnard Clay?
Best wishes,
Paul Herman
Great Basin Pottery
423-725 Scott Road
Doyle, California 96109 US
potter@psln.com
----------
>From: Gail Dapogny
>To: CLAYART@LSV.CERAMICS.ORG
>Subject: grinding (was Excuse my Ignorance)
>Date: Mon, Apr 28, 2003, 8:03 PM
>
> 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 yet another fresh beautiful day in Ann Arbor.
Roger Korn on tue 29 apr 03
Kayo and I use Cedar Heights Redart as our base clay, then follow
Vince's Sacred Recipe. Works great, so why change it? The terra sig is
applied at the 1.13 to 1.17 specific gravity range to bone dry pots, two
or three brushed coats for Kayo, sprayed "'til it looks right" for me.
We're asked about drying it out to a powder and reconstituting as
needed. This works fine, but let the reconstituted T/S sit for a few
hours before applying. Apparently, even the untra-fine T/S needs time to
rehydrate fully.
Hope this helps,
Roger
Paul Herman wrote:
>Hello Gail,
>
>I'm not a Terra Sigillata user but do have a couple of thoughts.
>
>I tried to use Barnard Clay as a slip under glazes and found it to be
>non-plastic and not very sticky. It flaked of whether it was put on
>damp, dry or bisque ware. It behaves like a clay with large particle
>size, and might not be a good one for Terra Sig. I can't find the
>analysis now, but remember that it is basically a Kaolin with some
>Silica, plus Iron and Manganese.
>
>Vince, have you experimented with Barnard Clay?
>
>Best wishes,
>
>Paul Herman
>Great Basin Pottery
>423-725 Scott Road
>Doyle, California 96109 US
>potter@psln.com
>
>----------
>
>
>>From: Gail Dapogny
>>To: CLAYART@LSV.CERAMICS.ORG
>>Subject: grinding (was Excuse my Ignorance)
>>Date: Mon, Apr 28, 2003, 8:03 PM
>>
>>
>>
>
>
>
>>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 yet another fresh beautiful day in Ann Arbor.
>>
>>
>
>______________________________________________________________________________
>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.
>
>
>
--
Roger Korn
McKay Creek Ceramics
In AZ: PO Box 463
4215 Culpepper Ranch Rd
Rimrock, AZ 86335
928-567-5699 <-
In OR: PO Box 436
31330 NW Pacific Ave.
North Plains, OR 97133
503-647-5464
Gail Dapogny on tue 29 apr 03
Hi Roger,
Thanks for your response. Can you tell me what color you get with that. I
was trying Barnard because I'd like a darker brown. Will the Redart give
me that?
Thanks -- Gail
>Kayo and I use Cedar Heights Redart as our base clay, then follow
>Vince's Sacred Recipe. Works great, so why change it? The terra sig is
>applied at the 1.13 to 1.17 specific gravity range to bone dry pots, two
>or three brushed coats for Kayo, sprayed "'til it looks right" for me.
>We're asked about drying it out to a powder and reconstituting as
>needed. This works fine, but let the reconstituted T/S sit for a few
>hours before applying. Apparently, even the untra-fine T/S needs time to
>rehydrate fully.
>
>Hope this helps,
>
>Roger
>
>
>>Hello Gail,
>>
>>I'm not a Terra Sigillata user but do have a couple of thoughts.
>>
>>I tried to use Barnard Clay as a slip under glazes and found it to be
>>non-plastic and not very sticky. It flaked off whether it was put on
>>damp, dry or bisque ware. It behaves like a clay with large particle
>>size, and might not be a good one for Terra Sig. I can't find the
>>analysis now, but remember that it is basically a Kaolin with some
>>Silica, plus Iron and Manganese.
>>
>>Vince, have you experimented with Barnard Clay?
>>
>>Best wishes,
>>
>>Paul Herman
>>Great Basin Pottery
>>423-725 Scott Road
>>Doyle, California 96109 US
>>potter@psln.com
>>
>>----------
>>
>>
>>>From: Gail Dapogny
>>>To: CLAYART@LSV.CERAMICS.ORG
>>>Subject: grinding (was Excuse my Ignorance)
>>>Date: Mon, Apr 28, 2003, 8:03 PM
>>>
>>>
>>>
>>
>>
>>
>>>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 yet another fresh beautiful day in Ann Arbor.
>>>
>>>
>>
>>______________________________________________________________________________
>>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.
>>
>>
>>
>
>--
>Roger Korn
>McKay Creek Ceramics
>In AZ: PO Box 463
> 4215 Culpepper Ranch Rd
> Rimrock, AZ 86335
> 928-567-5699 <-
>In OR: PO Box 436
> 31330 NW Pacific Ave.
> North Plains, OR 97133
> 503-647-5464
>
>______________________________________________________________________________
>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.
Vince Pitelka on tue 29 apr 03
> Any thoughts? Or any help on the terra sig? I was trying to make one out
> of Barnard slip.
Gail -
I have never been able to successfully make a terra sig out of Barnard or
Blackbird. It just all sinks to the bottom as heavy sediment. It is
apparently far too coarse when using my regular method. So, ball milling
with a rock polisher should do the trick. But of course you would have to
ball mill a significant quantity of clay before making the terra sig, and
that will require many batches in a rock polisher. Still worth it.
Good luck -
- 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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