Terrance Lazaroff on mon 24 dec 01
If you have other bottles without glaze inside then be sure they will also
break easily. The glaze has little to do with it. It could happen with
many glazes. I know from experience.
Terrance
Tis the season to be jolly.
Elca Branman on mon 24 dec 01
On Mon, 24 Dec 2001 07:05:01 -0800 Marta Matray Gloviczki
writes:
> why did they fell apart in a strange puzzle-like way?
> any suggestions, please,
> marta
Answer..Ancient shinto curse on Europeans using shino
Merry, merry,
Elca
> =====
> marta matray gloviczki
> rochester,mn
> http://users.skynet.be/russel.fouts/Marta.htm
> http://www.silverhawk.com/crafts/gloviczki/welcome.html
>
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Earl Brunner on mon 24 dec 01
Many glazes do not match exactly the expansion or contraction rates of the clay
they are on. Shivering and crazing are examples of this. What you describe is
also an example. This problem doesn't always appear obvious when the pot is glazed
both inside and out because the two glazes surfaces "cancel" or equalize each
other. It's not a shino problem perse, any glaze that doesn't fit the clay can do
it.
Marta Matray Gloviczki wrote:
> hello everybody,
> i have a shino question.
> this just ended semester i was a special student at
> our college here in town.
> i signed up because i wanted to experiment and learn a
> little bit about shino, so i needed access to a gas
> kiln...(i know that ababi is working hard to come up
> with the perfect electric-shino :-)))
> anyway, before our very last firing i glazed my pots
> in the last minute in a hurry.
> after firing and unloading, i noticed two of my
> bottles had cracks. they fell apart in my hands in a
> rather interesting pattern and i noticed: in
> the hurry, i forgot to glaze the bottles inside!
> only those two broke which had no glaze inside.
> was that the reason they broke? is this something
> special to shino only?
> why did they fell apart in a strange puzzle-like way?
> any suggestions, please,
> marta
>
> =====
> marta matray gloviczki
> rochester,mn
> http://users.skynet.be/russel.fouts/Marta.htm
> http://www.silverhawk.com/crafts/gloviczki/welcome.html
>
> __________________________________________________
> Do You Yahoo!?
> Send your FREE holiday greetings online!
> http://greetings.yahoo.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.
--
Earl Brunner
http://coyote.accessnv.com/bruec
mailto:bruec@anv.net
Hank Murrow on mon 24 dec 01
>hello everybody,
>i have a shino question.
Before our very last firing i glazed my pots
>in the last minute in a hurry.
>after firing and unloading, i noticed two of my
>bottles had cracks. they fell apart in my hands in a
>rather interesting pattern and i noticed: in
>the hurry, i Had forgotten to glaze the bottles inside!
>only those two broke which had no glaze inside.
>was that the reason they broke? is this something
>special to shino only?
>why did they fell apart in a strange puzzle-like way?
>any suggestions, please,
>marta
Dear Marta;
A good question, and one that might be tested by trying different
glazes on the inside. Perhaps a low expansion one like shino itself, and a
high expansion one like a typical celadon.
In a recent firing I glazed the inside of four of my shino tea
caddies with a natural dug celadon. Those four cracked during and after the
cooling of the kiln. Doesn't happen when glazed inside and out with shino.
Good Luck in the Hunt! Hank in Eugene
Marta Matray Gloviczki on mon 24 dec 01
hello everybody,
i have a shino question.
this just ended semester i was a special student at
our college here in town.
i signed up because i wanted to experiment and learn a
little bit about shino, so i needed access to a gas
kiln...(i know that ababi is working hard to come up
with the perfect electric-shino :-)))
anyway, before our very last firing i glazed my pots
in the last minute in a hurry.
after firing and unloading, i noticed two of my
bottles had cracks. they fell apart in my hands in a
rather interesting pattern and i noticed: in
the hurry, i forgot to glaze the bottles inside!
only those two broke which had no glaze inside.
was that the reason they broke? is this something
special to shino only?
why did they fell apart in a strange puzzle-like way?
any suggestions, please,
marta
=====
marta matray gloviczki
rochester,mn
http://users.skynet.be/russel.fouts/Marta.htm
http://www.silverhawk.com/crafts/gloviczki/welcome.html
__________________________________________________
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Send your FREE holiday greetings online!
http://greetings.yahoo.com
Tony Ferguson on mon 24 dec 01
Marta,
Did you glaze them raw or bisque? I have noticed this before with some
bisque pots--shino likes to rip pots apart. If you glaze one side, you must
wet the other--helps with expansion and contraction. If you glazed
raw--same expansion problem, just magnified.
Thank you.
Tony Ferguson
315 N. Lake Ave. Apt. 401
Duluth, MN 55806
USA
218.727.6339
Stoneware, Porcelain, Raku
http://www.AquariusArtGallery.com
----- Original Message -----
From: "Marta Matray Gloviczki"
To:
Sent: Monday, December 24, 2001 7:05 AM
Subject: shino question
> hello everybody,
> i have a shino question.
> this just ended semester i was a special student at
> our college here in town.
> i signed up because i wanted to experiment and learn a
> little bit about shino, so i needed access to a gas
> kiln...(i know that ababi is working hard to come up
> with the perfect electric-shino :-)))
> anyway, before our very last firing i glazed my pots
> in the last minute in a hurry.
> after firing and unloading, i noticed two of my
> bottles had cracks. they fell apart in my hands in a
> rather interesting pattern and i noticed: in
> the hurry, i forgot to glaze the bottles inside!
> only those two broke which had no glaze inside.
> was that the reason they broke? is this something
> special to shino only?
> why did they fell apart in a strange puzzle-like way?
> any suggestions, please,
> marta
>
>
>
> =====
> marta matray gloviczki
> rochester,mn
> http://users.skynet.be/russel.fouts/Marta.htm
> http://www.silverhawk.com/crafts/gloviczki/welcome.html
>
> __________________________________________________
> Do You Yahoo!?
> Send your FREE holiday greetings online!
> http://greetings.yahoo.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.
_________________________________________________________
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Get your free @yahoo.com address at http://mail.yahoo.com
Marta Matray Gloviczki on tue 25 dec 01
dear hank,
thanks for answering!
you mean, four of YOUR shino pots cracked too?
well, i dont feel so bad anymore :-))
and, how do you know that yours cracked during and after the cooling of the
kiln? did you see throu your "window"?
really, can you know the egzact time of the cracking?
and, if yours were glazed inside with celadon, did you still get those
funny shaped, puzzle like cracks?
marta
On Mon, 24 Dec 2001 19:09:36 -0800, Hank Murrow wrote:
>Dear Marta;
>
> A good question, and one that might be tested by trying different
>glazes on the inside. Perhaps a low expansion one like shino itself, and a
>high expansion one like a typical celadon.
>
> In a recent firing I glazed the inside of four of my shino tea
>caddies with a natural dug celadon. Those four cracked during and after the
>cooling of the kiln. Doesn't happen when glazed inside and out with shino.
>
> Good Luck in the Hunt! Hank in Eugene
Hank Murrow on tue 25 dec 01
>dear hank,
>thanks for answering!
>you mean, four of YOUR shino pots cracked too?
>well, i dont feel so bad anymore :-))
>and, how do you know that yours cracked during and after the cooling of the
>kiln? did you see throu your "window"?
>really, can you know the egzact time of the cracking?
>and, if yours were glazed inside with celadon, did you still get those
>funny shaped, puzzle like cracks?
>marta
Mine cracked in a spiral fashion. I could hear them go below about 300F and
when I opened the kiln. Stopped glazing them on the inside with the
celadon. No more cracks.
Cheers, Hank
Ron Roy on sun 30 dec 01
Something wrong with this explanation but I don't have enough information
to actually make a difinitive statement about what is wrong.
What I need is the recipe of any shino glaze that is suspected of having
too low an expansion for the clay it's on - resulting in glaze dunting -
which this surely is.
Most Shino glazes are crazed - because of all that soda. Crazing (glazes
under tension) (glaze too small for the clay after cooling contraction.)
Crazed glazes do not break pots - make em easier to break but not by
themselves.
Could be - if a shino glaze had enough lithium and was on a body with
significant cristobalite - could make a pot break.
Anyway - to trouble shoot this I need the recipe and a description of the
clay body and firing cycle.
The other part of the statement below I don't understand - why would the
type of firing effect the expansion/contraction profile of clay and glaze -
don't they all wind up in the same ball park at the end?
RR
>Did you glaze them raw or bisque? I have noticed this before with some
>bisque pots--shino likes to rip pots apart. If you glaze one side, you must
>wet the other--helps with expansion and contraction. If you glazed
>raw--same expansion problem, just magnified.
Ron Roy
RR# 4
15084 Little Lake Rd..
Brighton,
Ontario, Canada
KOK 1H0
Residence 613-475-9544
Studio 613-475-3715
Fax 613-475-3513
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