John Britt on mon 19 apr 04
Rhonda,
Try this in an electric kiln to cone 10.
OIL SPOT #3
Cone 10
NC-4 Soda Feldspar 54.62
Silica 29.41
Whiting 4.20
EPK Kaolin 7.56
Dolomite 4.20
Red Iron Oxide 6.72
Cobalt Carbonate 4.20
John Britt
RHONDA FRIED on mon 19 apr 04
Hi fellow clayarters,
John Britt lit a spark with his presentation at Nceca on oil spot =
glazes. Now I've spent a few hours and poured over the a few thousand =
of the archives and my glaze books, and am not really happy with my =
results. I think he will have a book out soon, but I have "empty bowls" =
to glaze, and this would be a great time to experiment.
If any of you generous and gracious people have a Cone 10 Reduction Oil =
Spot Glaze recipe to share, I would sure appreciate it.
Rhonda Fried
Friedlover@msn.com
Hank Murrow on mon 19 apr 04
Dear Rhonda;
John fires his oil spot glazes in OXIDATION to cone 10, so if you can
do this you may be successful. Let us know if you are able to fire
completely in oxidation to cone 10.
cheers, Hank
On Apr 19, 2004, at 8:43 AM, RHONDA FRIED wrote:
> Hi fellow clayarters,
> John Britt lit a spark with his presentation at Nceca on oil spot
> glazes. Now I've spent a few hours and poured over the a few
> thousand of the archives and my glaze books, and am not really happy
> with my results. I think he will have a book out soon, but I have
> "empty bowls" to glaze, and this would be a great time to experiment.
> If any of you generous and gracious people have a Cone 10 Reduction
> Oil Spot Glaze recipe to share, I would sure appreciate it.
Vince Pitelka on mon 19 apr 04
One of my students, Toshiko Carnal, has been achieving some success with oil
spot temmokus, firing them to cone 10 oxidation, following John Britt's
directions in his CM article.
Best wishes -
- Vince
Vince Pitelka
Appalachian Center for Craft, Tennessee Technological University
Smithville TN 37166, 615/597-6801 x111
vpitelka@dtccom.net, wpitelka@tntech.edu
http://iweb.tntech.edu/wpitelka/
http://www.tntech.edu/craftcenter/
Dan Dermer on mon 19 apr 04
Rhonda,
The following Ceramics Monthly article by John Britt contains five recipes
that he deems the "best of..." the ones he formulated and tested:
http://www.ceramicsmonthly.org/mustreads/oilspot.asp
Don't know if these were the ones you had already tested, but thought you
and others might find the information useful. I guess the other factor is
finding something that will work in reduction, which I understand is not the
usual atmosphere for oilspot glazes. A full oxidation firing is apparently
crucial to good oilspot formation (see the full text of the article...).
One other idea on a related but slightly different tangent... check out Paul
Davis' Tea Dust glaze. It is basically a temmoku but yields interesting
yellow-green crystals on a black background, probably due to the magnesium
in the formula. I tested it in my last reduction firing, and thought it was
a winner!
Paul Davis Teadust Black (c8-10 reduction)
Talc 7.41%
Whiting 15.74%
Custer 39.81%
Ball Clay (OM-4) 12.04%
Flint 200 25.00%
Add:
Red Iron Oxide 9.3%
Let me know if you want to see a picture of my test bowl with this glaze.
Maybe that will tide you over until you find just the right oil spot glaze!
Let us know if you find an oilspot that works in a reduction firing
schedule -- I'd love that.
-Dan
http://pages.sbcglobal.net/ddermer
David Hewitt on tue 20 apr 04
You don't need to reduction fire to get a good oil spot glaze. Mine is
produced in an electric kiln fired to cone 9.
You can see examples on my web site and, if you think this is of
interest to you, please email me for the recipe and firing details.
David
In message , RHONDA FRIED writes
>Hi fellow clayarters,
>John Britt lit a spark with his presentation at Nceca on oil spot glazes. Now
>I've spent a few hours and poured over the a few thousand of the archives and
>my glaze books, and am not really happy with my results. I think he will have a
>book out soon, but I have "empty bowls" to glaze, and this would be a great time
>to experiment.
>If any of you generous and gracious people have a Cone 10 Reduction Oil Spot
>Glaze recipe to share, I would sure appreciate it.
>Rhonda Fried
>Friedlover@msn.com
--
David Hewitt
David Hewitt Pottery
South Wales UK
Web:- http://www.dhpot.demon.co.uk
Ivor and Olive Lewis on thu 22 apr 04
Dear Marc Hudson,
As I recall, not having the article to hand, this Oil Spot Glaze is
possible because Iron Oxide begins to decompose above cone 8,
releasing Oxygen which bubbles to the surface. As the bubbles burst
the highly viscous glaze slowly settles down but the colour
differentiation which comes from the contrast between the old and new
iron compounds remains giving the visual effect of "Oil Spots"
So decreasing the temperature down by four notches would prevent the
effect from occurring.
Forget about "Eutectics" unless you mean some product that melts at a
much lower temperature than your usual maturity value. Just add
another shovel full of Boron Frit.
Have fun trying.
Best regards,
Ivor Lewis. Redhill, South Australia
----- Original Message -----
From: "Marc Hudson"
To:
Sent: Thursday, 22 April 2004 5:04
Subject: Re: oil spot glazes
John,
Your oil spot glazes and pots are extraordinary! I read your on-line
oil-
spot glaze article from Ceramics Monthly and I'm wondering if the
thermal
reduction of iron occurs only at ^10 (2350=BAF), or can eutetics be used
to
reduce the temperature to around ^6 (2210=BAF - 1200=BAC)?
Marc Hudson
Playing with Fire
Espa=F1ola, NM, USA
www.artfulnm.org/hudson.html
---------- Original Message -----------
From: John Britt
To: CLAYART@LSV.CERAMICS.ORG
Sent: Tue, 20 Apr 2004 20:46:58 -0400
Subject: Re: oil spot glazes #2
> Rhonda,
>
> Here is a small photo:
>
> http://www.ackland.org/art/exhibitions/shatzman/intro.html
>
> John Britt
>
>
______________________________________________________________________
________
> 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.
------- End of Original Message -------
______________________________________________________________________
________
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.
Marc Hudson on thu 22 apr 04
Thank you Ivor,
I enjoy reading your knowledgeable posts. I know I can't convert all non=
-^6-=20
glazes to ^6 oxidizing, but I really enjoy the chalange, and I have had =
some=20
measure of success with ash glazes! I will try "adding another shovel fu=
ll=20
of Boron Frit"!
Marc Hudson
Playing with Fire
Espa=F1ola, NM, USA
www.artfulnm.org/hudson.html
---------- Original Message -----------
From: Ivor and Olive Lewis
To: CLAYART@LSV.CERAMICS.ORG
Sent: Thu, 22 Apr 2004 12:02:17 +0930
Subject: Re: oil spot glazes
> Dear Marc Hudson,
> As I recall, not having the article to hand, this Oil Spot Glaze is
> possible because Iron Oxide begins to decompose above cone 8,
> releasing Oxygen which bubbles to the surface. As the bubbles burst
> the highly viscous glaze slowly settles down but the colour
> differentiation which comes from the contrast between the old and new
> iron compounds remains giving the visual effect of "Oil Spots"
> So decreasing the temperature down by four notches would prevent the
> effect from occurring.
> Forget about "Eutectics" unless you mean some product that melts at a
> much lower temperature than your usual maturity value. Just add
> another shovel full of Boron Frit.
> Have fun trying.
> Best regards,
> Ivor Lewis. Redhill, South Australia
>=20
> ----- Original Message -----
> From: "Marc Hudson"
> To:
> Sent: Thursday, 22 April 2004 5:04
> Subject: Re: oil spot glazes
>=20
> John,
>=20
> Your oil spot glazes and pots are extraordinary! I read your on-line
> oil-
> spot glaze article from Ceramics Monthly and I'm wondering if the
> thermal
> reduction of iron occurs only at ^10 (2350=BAF), or can eutetics be=20
> used to reduce the temperature to around ^6 (2210=BAF - 1200=BAC)?
>=20
> Marc Hudson
> Playing with Fire
> Espa=F1ola, NM, USA
> www.artfulnm.org/hudson.html
>=20
> ---------- Original Message -----------
> From: John Britt
> To: CLAYART@LSV.CERAMICS.ORG
> Sent: Tue, 20 Apr 2004 20:46:58 -0400
> Subject: Re: oil spot glazes #2
>=20
> > Rhonda,
> >
> > Here is a small photo:
> >
> > http://www.ackland.org/art/exhibitions/shatzman/intro.html
> >
> > John Britt
> >
> >
> ______________________________________________________________________=20
________
> > 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.
> ------- End of Original Message -------
>=20
> ______________________________________________________________________=20
________ Send postings to clayart@lsv.ceramics.org
>=20
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>=20
> Moderator of the list is Mel Jacobson who may be reached at
> melpots@pclink.com.
>=20
>=20
_________________________________________________________________________=
_____
> Send postings to clayart@lsv.ceramics.org
>=20
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>=20
> Moderator of the list is Mel Jacobson who may be reached at=20
melpots@pclink.com.
------- End of Original Message -------
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