Karin Hurt on thu 4 dec 03
I biesqued my Cone 6 Terracotta at 06, all went well. The next step a =
Cone 4 oxidation firing.=20
Problem 1: There are dark blue streaks in the clay here and there, not =
very attractive, especially since it was on slab built nativity figures. =
Problem 2: There are grayish smudges on all of the figures, one has dark =
fingertips, Mary has smudges on her face (not very attractive), and so =
it goes. I have no clue what could have caused it.=20
The only thing I can think of is that it could have been caused by my =
using Magic Water instead of slip to put the slabs together. Does anyone =
have a clue what could have caused this. The smudges are the color of =
ash.
Thanks,
Karin Hurt
Lake Havasu City, Arizona
http://www.laughingbearpottery.com
Karin Hurt on fri 5 dec 03
Hi John,
My teacher mentioned that I may have gotten a slight reduction, however, the
other potter got the same thing. I left the peeps open when I re-fired and
Cone 6 and again had the same result. I tossed what clay I had left out and
won't use it again.
I work on different areas for white and brown clay and am a freak for
neatness and not contaminating, I know it could still happen, but the result
of all this was to weird to believe. Thank you for your input, it helped
and was kind of you to take the time.
Karin
Lake Havasu City, Arizona
http://www.laughingbearpottery.com
----- Original Message -----
From: John K Dellow
To:
Sent: Thursday, December 04, 2003 7:47 PM
Subject: Re: another Terracotta dilemma
> Karin ,
> Problem 1 , You may have gone into slight reduction /high end neutral
> in either firing.
> Problem 2 , do you use a white clay in the studio . You may have
> picked up a white pot and
> then picked up the terra-cotta pot. You would not see the fingerprints
> or smudges until the
> terra-cotta was fired :).
>
> Karin Hurt wrote:
>
> >I biesqued my Cone 6 Terracotta at 06, all went well. The next step a
Cone 4 oxidation firing.
> >Problem 1: There are dark blue streaks in the clay here and there, not
very attractive, especially since it was on slab built nativity figures.
> >
> >Problem 2: There are grayish smudges on all of the figures, one has dark
fingertips, Mary has smudges on her face (not very attractive), and so it
goes. I have no clue what could have caused it.
> >
> >The only thing I can think of is that it could have been caused by my
using Magic Water instead of slip to put the slabs together. Does anyone
have a clue what could have caused this. The smudges are the color of ash.
> >
> >Thanks,
> >
> >Karin Hurt
> >
> >
> >Lake Havasu City, Arizona
> >http://www.laughingbearpottery.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.
> >
> >
> >
>
> --
>
> John Dellow "the flower pot man"
> From the land down under
> Home Page http://www.welcome.to/jkdellow
> http://digitalfire.com/education/people/dellow/
>
>
____________________________________________________________________________
__
> 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.
John K Dellow on fri 5 dec 03
Karin ,
Problem 1 , You may have gone into slight reduction /high end neutral
in either firing.
Problem 2 , do you use a white clay in the studio . You may have
picked up a white pot and
then picked up the terra-cotta pot. You would not see the fingerprints
or smudges until the
terra-cotta was fired :).
Karin Hurt wrote:
>I biesqued my Cone 6 Terracotta at 06, all went well. The next step a Cone 4 oxidation firing.
>Problem 1: There are dark blue streaks in the clay here and there, not very attractive, especially since it was on slab built nativity figures.
>
>Problem 2: There are grayish smudges on all of the figures, one has dark fingertips, Mary has smudges on her face (not very attractive), and so it goes. I have no clue what could have caused it.
>
>The only thing I can think of is that it could have been caused by my using Magic Water instead of slip to put the slabs together. Does anyone have a clue what could have caused this. The smudges are the color of ash.
>
>Thanks,
>
>Karin Hurt
>
>
>Lake Havasu City, Arizona
>http://www.laughingbearpottery.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.
>
>
>
--
John Dellow "the flower pot man"
From the land down under
Home Page http://www.welcome.to/jkdellow
http://digitalfire.com/education/people/dellow/
Ron Roy on sat 6 dec 03
This may be soluble salts in the clay - usually a small amount of Barium
carb is added to such clays to tie up the salts and prevent blooming.
Ask you clay supplier if they are adding barium to stop it.
Magic water may be the - or part of the problem - it certainly is soluble
salts - I use vinegar for joining - works like a charm.
The problem is with darker clays - with white clays you don't usually
notice the salts.
RR
>I biesqued my Cone 6 Terracotta at 06, all went well. The next step a Cone
>4 oxidation firing.
>Problem 1: There are dark blue streaks in the clay here and there, not
>very attractive, especially since it was on slab built nativity figures.
>
>Problem 2: There are grayish smudges on all of the figures, one has dark
>fingertips, Mary has smudges on her face (not very attractive), and so it
>goes. I have no clue what could have caused it.
>
>The only thing I can think of is that it could have been caused by my
>using Magic Water instead of slip to put the slabs together. Does anyone
>have a clue what could have caused this. The smudges are the color of ash.
>
>Thanks,
>
>Karin Hurt
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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