Louis Katz on thu 7 oct 04
Hi Dave,
You would be better off with a bisqued on vitreous engobe than a stain.
You need good adhesion between the crawling glazes and the pot. The
stain, used by itself beyond acting like a layer of dust and disrupting
adhesion may also create a layer of material with a much different
coefficient of expansion. It the glaze is poorly adhered, then this
could be the last straw.
Kurt Weiser uses a cobalt blue engobe, or something engobe-like on his
textured bowls.
Image:
http://members.shaw.ca/selfridgeceramiccollection/selfridgeuspots/
largepics/001sr149.jpg
Louis
On Oct 7, 2004, at 12:19 PM, david mcbeth wrote:
> I have an advanced student working with texture glazes. This is an
> area I have very little experience with. He applied the glaze to
> bisqued stoneware, we fired the pots and the glaze crawled
> beautifully. He is limiting his experiments to white glazes for now.
> So I suggested the glaze would look real nice over a black surface.
> He applied black mason stain to the surface of several bisqued pots,
> glazed them with the texture glaze and we fired them. Most of the
> glaze shivered off the pots. Any glaze that remained on the pots
> curled up instead of crawling as previously. In the kiln I am
> unloading today, he had another little piece with the texture glaze
> but no stain underneath and the glaze once again crawled very nicely.
>
> Anyone out there working with texture glazes who has some input on
> what I should tell this student about why the glaze has acted as
> described? thanks.
>
> Dave
> --
> David McBeth, MFA
> Professor of Art
> Assistant Director of Honors Programs
>
> 330 B Gooch Hall
> The University of Tennessee at Martin
> Martin, Tennessee 38238
>
> 731-587-7416
>
> _______________________________________________________________________
> _______
> Send postings to clayart@lsv.ceramics.org
>
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>
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>
>
Louis Katz
http://www.tamucc.edu/~lkatz
Marcia Selsor on thu 7 oct 04
Use an underglaze recipe with the black stain
Something like
33% EPK
33% Frit 3134
33% stain
Also try some Amaco velvets as a base
Try varying the amount of magnesium Carb. in the base recipe. It will
change the shape and character of the crawling.
Marcia Selsor
On Oct 7, 2004, at 11:19 AM, david mcbeth wrote:
> I have an advanced student working with texture glazes. This is an
> area I have very little experience with. He applied the glaze to
> bisqued stoneware, we fired the pots and the glaze crawled
> beautifully. He is limiting his experiments to white glazes for now.
> So I suggested the glaze would look real nice over a black surface.
> He applied black mason stain to the surface of several bisqued pots,
> glazed them with the texture glaze and we fired them. Most of the
> glaze shivered off the pots. Any glaze that remained on the pots
> curled up instead of crawling as previously. In the kiln I am
> unloading today, he had another little piece with the texture glaze
> but no stain underneath and the glaze once again crawled very nicely.
>
> Anyone out there working with texture glazes who has some input on
> what I should tell this student about why the glaze has acted as
> described? thanks.
>
> Dave
> --
> David McBeth, MFA
> Professor of Art
> Assistant Director of Honors Programs
>
> 330 B Gooch Hall
> The University of Tennessee at Martin
> Martin, Tennessee 38238
>
> 731-587-7416
>
> _______________________________________________________________________
> _______
> 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 on thu 7 oct 04
Either use a dark clay, or try putting the stain on the damp greenware
before bisquing and mix the stain with some slip.
Earl Brunner
Las Vegas, NV
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of david mcbeth
Sent: Thursday, October 07, 2004 10:20 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: texture/crawl glazes help!
I have an advanced student working with texture glazes. This is an
area I have very little experience with. He applied the glaze to
bisqued stoneware, we fired the pots and the glaze crawled
beautifully. He is limiting his experiments to white glazes for now.
So I suggested the glaze would look real nice over a black surface.
He applied black mason stain to the surface of several bisqued pots,
glazed them with the texture glaze and we fired them. Most of the
glaze shivered off the pots. Any glaze that remained on the pots
curled up instead of crawling as previously. In the kiln I am
unloading today, he had another little piece with the texture glaze
but no stain underneath and the glaze once again crawled very nicely.
Anyone out there working with texture glazes who has some input on
what I should tell this student about why the glaze has acted as
described? thanks.
Dave
--
David McBeth, MFA
Professor of Art
Assistant Director of Honors Programs
330 B Gooch Hall
The University of Tennessee at Martin
Martin, Tennessee 38238
731-587-7416
____________________________________________________________________________
__
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.
david mcbeth on thu 7 oct 04
I have an advanced student working with texture glazes. This is an
area I have very little experience with. He applied the glaze to
bisqued stoneware, we fired the pots and the glaze crawled
beautifully. He is limiting his experiments to white glazes for now.
So I suggested the glaze would look real nice over a black surface.
He applied black mason stain to the surface of several bisqued pots,
glazed them with the texture glaze and we fired them. Most of the
glaze shivered off the pots. Any glaze that remained on the pots
curled up instead of crawling as previously. In the kiln I am
unloading today, he had another little piece with the texture glaze
but no stain underneath and the glaze once again crawled very nicely.
Anyone out there working with texture glazes who has some input on
what I should tell this student about why the glaze has acted as
described? thanks.
Dave
--
David McBeth, MFA
Professor of Art
Assistant Director of Honors Programs
330 B Gooch Hall
The University of Tennessee at Martin
Martin, Tennessee 38238
731-587-7416
Barbara Lewis on fri 8 oct 04
David: I just read Louis Katz's reply, and I agree -- the stain becomes
chalky and prevents adhesion. I had a similar experience. But continuing with
the discussion of experimenting with crawling glazes, I saw some nice effects
where someone took a pot that they had applied the crawl glaze and then fired a
transparent glaze at a lower temperature on the crawl glaze. Wonderful
results. Barbara
Snail Scott on sat 9 oct 04
At 12:19 PM 10/7/2004 -0500, you wrote:
>...applied black mason stain to the surface of several bisqued pots,
>glazed them with the texture glaze and we fired them. Most of the
>glaze shivered off the pots.
I suspect that the Mason stain didn't allow
a good bond between the glaze and the clay.
Maybe re-bisque to fuse the mason stain
(which was mixed with a little flux, I assume)
before applying the glaze next time, or (my
poreference) apply the stain to greenware
before the bisque.
-Snail
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