Bun Bun on thu 10 jan 02
I have recently gotten back to playing with clay and would like to try
glazing greenware. I have my own recipes for glazes and a few commercial
ones on hand. Gerstly Borate is not predominate in my glazes so expansion
and shrinkage might be minimal. Most of my firing will be in the ^6 range
except for any bisque firings. Would it be advisable to do a bisque firing
on all or could I chance a greenware glazing at that cone? Is it possible to
be this lazy and get away with it?
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Snail Scott on thu 10 jan 02
At 03:02 PM 1/10/02 -0600, you wrote:
Would it be advisable to do a bisque firing
>on all or could I chance a greenware glazing at that cone?
It's definitely possible to glaze greenware, for
almost any firing temperature. I've done it quite
a bit at ^6.
Some forms and some clay bodies lend themselves to
one-shot firings better than others, though. Work
with thin edges can be vulnerable to re-wetting.
Pottery, since it typically gets glazed on both
sides of a thin surface, can react badly, but I
will let some of the one-shot-firing potters on
the list address that issue from their own
experience.
I recommend using glazes with a fairly high clay
content, so that they will shrink with the piece
before sintering. Albany slip type glazes work
nicely for this. Many commercial glazes will work
OK, but you'll have to find out which by trying
them.
I prefer to glaze while the work is still leather-
hard and less absorbent; this seems to eliminate
nearly all re-wetting problems.
Keep in mind that greenware, even if bone-dry, is
less absorbent than bisque, so adjust the thickness
of the glaze accordingly, so that the layer on your
piece comes out the same.
Check the archives under 'one-shot', 'single-shot',
or some variation thereon. Lots of material there!
-Snail
Tony Ferguson on thu 10 jan 02
Bun,
Unfortunetly there are only 2 books: Fran tristram's "Single Firing the
Pros and Cons" and Dennis Park's "oil firing and single firing...(I can't
remember the exact title). If I get my act together, I will write a book on
single firing. But till then, here you go:
The only way to know is to start testing your clay and glazes by doing
everything you normally do except skip the bisque--you can fire greenware
that is glazed to cone 6--you will just have to play around with getting
your glaze to fit your body--you may luck out and it might fit right away.
The first thing I would do is glaze some tests leather hard as well as bone
dry and see if your glaze sticks. If it doesn't, then you will want to:
1. spray it on
or
2. add a sticking agent (cmc gum, etc)
or
3. adjusting the glazes elements that are shrinking too much for the pot
(see Ron Roy--I'm not experienced in cone 6)
IF your clay body imploads, cracks, or the walls pull themselves apart,
then:
1. spray the glaze on
or
2. be very quick when you glaze (dip & pour) so that you don't over-saturate
the body. You can also brush glazes on.
Good luck! Let me know what happens.
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: "Bun Bun"
To:
Sent: Thursday, January 10, 2002 1:02 PM
Subject: Glazing Greenware???
> I have recently gotten back to playing with clay and would like to try
> glazing greenware. I have my own recipes for glazes and a few commercial
> ones on hand. Gerstly Borate is not predominate in my glazes so expansion
> and shrinkage might be minimal. Most of my firing will be in the ^6 range
> except for any bisque firings. Would it be advisable to do a bisque firing
> on all or could I chance a greenware glazing at that cone? Is it possible
to
> be this lazy and get away with it?
>
>
>
> _________________________________________________________________
> Send and receive Hotmail on your mobile device: http://mobile.msn.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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Tommy Humphries on thu 10 jan 02
The best advice as always is to just go ahead and do a test run...No # of
opinions from us can give the amount of information that test run will give
you. Do full size test pots, not tiles. This will tell you which of the
glazes will flake off the greenware as it dries, which will shiver off when
cooling etc.
TEST
Tommy
----- Original Message -----
From: "Bun Bun"
To:
Sent: Thursday, January 10, 2002 3:02 PM
Subject: Glazing Greenware???
> I have recently gotten back to playing with clay and would like to try
> glazing greenware. I have my own recipes for glazes and a few commercial
> ones on hand. Gerstly Borate is not predominate in my glazes so expansion
> and shrinkage might be minimal. Most of my firing will be in the ^6 range
> except for any bisque firings. Would it be advisable to do a bisque firing
> on all or could I chance a greenware glazing at that cone? Is it possible
to
> be this lazy and get away with it?
>
>
>
> _________________________________________________________________
> Send and receive Hotmail on your mobile device: http://mobile.msn.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.
>
Paul Herman on fri 11 jan 02
Bun Bun,
I use the dry raw glazing technique on some of my highfired work
(^11-12). MOST of my normal stoneware glazes work fine in single firing.
Test them all. Don't glaze the inside and then wait around to do the
outside or you'll have two halves. Dennis Parks' book "A Potter's Guide
to Raw Glazing and Oil Firing" is excellant, though I think it may be
out of print.
From Paul in frosty NE California
----------
>From: Bun Bun
>To: CLAYART@LSV.CERAMICS.ORG
>Subject: Glazing Greenware???
>Date: Thu, Jan 10, 2002, 1:02 PM
>
> I have recently gotten back to playing with clay and would like to try
> glazing greenware. I have my own recipes for glazes and a few commercial
> ones on hand. Gerstly Borate is not predominate in my glazes so expansion
> and shrinkage might be minimal. Most of my firing will be in the ^6 range
> except for any bisque firings. Would it be advisable to do a bisque firing
> on all or could I chance a greenware glazing at that cone? Is it possible to
> be this lazy and get away with it?
>
>
>
> _________________________________________________________________
> Send and receive Hotmail on your mobile device: http://mobile.msn.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.
>
Marcia Selsor on fri 11 jan 02
It is a good idea to add bentonite to a glaze for greenware because it
helps it (glaze) shrink with the pot. You might try a test with an
addition of 5% Bentonite (blunge it first before adding to the glaze).
Marcia Selsor
> ----- Original Message -----
> From: "Bun Bun"
> To:
> Sent: Thursday, January 10, 2002 3:02 PM
> Subject: Glazing Greenware???
>
> > I have recently gotten back to playing with clay and would like to try
> > glazing greenware. I have my own recipes for glazes and a few commercial
> > ones on hand. Gerstly Borate is not predominate in my glazes so expansion
> > and shrinkage might be minimal. Most of my firing will be in the ^6 range
> > except for any bisque firings. Would it be advisable to do a bisque firing
> > on all or could I chance a greenware glazing at that cone? Is it possible
> to
> > be this lazy and get away with it?
> >
> >
> >
> > _________________________________________________________________
> > Send and receive Hotmail on your mobile device: http://mobile.msn.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.
> >
>
> ______________________________________________________________________________
> 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.
--
Marcia Selsor
selsor@imt.net
http://www.imt.net/~mjbmls
http://www.imt.net/~mjbmls/Tuscany2002.html
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