ASHPOTS@aol.com on fri 19 apr 96
To all of you who fire CONE 10 Reduction. At the end of the fire, do you
re-oxidize for a few minutes or do you just close it up at the end of the
Cone 10 fire?
Capt. Mark Issenberg
MADE IN THE SHADE PLANTS & POTTERY
7780 SW 118th Street
Miami, FL 33156
(305) 232-0278
ELCAB@delphi.com on fri 19 apr 96
We just turn the kiln off, and guess what..it oxodizes...Elca
Branman Elcab@delphi.com
Nils Lou on sat 20 apr 96
Outside of specialized laboratory furnaces or by firing down with a
reduced flame you cannot avoid oxidizing when you shut off the kiln
because it will immediately begin inspirating air. An oxy-probe
demonstrates this in precise fashion. So, the answer is that we all
oxidize at the end of the fire (probably) Nils Lou
On Fri, 19 Apr 1996 ASHPOTS@aol.com wrote:
> ----------------------------Original message----------------------------
> To all of you who fire CONE 10 Reduction. At the end of the fire, do you
> re-oxidize for a few minutes or do you just close it up at the end of the
> Cone 10 fire?
>
> Capt. Mark Issenberg
> MADE IN THE SHADE PLANTS & POTTERY
> 7780 SW 118th Street
> Miami, FL 33156
> (305) 232-0278
>
art_selsor@vicuna.emcmt.edu on sat 20 apr 96
I usually clear the kiln at the end of the reduction just to check the
cones. They are too difficult to see when reducing.
Marcia in Montana
Ron Roy on sun 21 apr 96
>----------------------------Original message----------------------------
>To all of you who fire CONE 10 Reduction. At the end of the fire, do you
>re-oxidize for a few minutes or do you just close it up at the end of the
>Cone 10 fire?
>
>Capt. Mark Issenberg
>MADE IN THE SHADE PLANTS & POTTERY
>7780 SW 118th Street
>Miami, FL 33156
>(305) 232-0278
Hi Mark,
713 firing so far,
Have tried it all ways and never found a difference.
I have long slow firings and have taken to crash cooling from 1260C down to
1200 for the last few years and have not noticed any differences. There are
many colours I don't use and there may be a case for cooling matt glazes
slower - I am sure you will get other responses.
I was told in school the clay might stay grey/black if there was no oxygen
to turn the FeO back to Fe2O3 on the surface but I don't know of any kilns
which are tight enough to exclude air.
Ron Roy, Toronto, Canada
Donald Goldsobel on sun 21 apr 96
>----------------------------Original message----------------------------
>I usually clear the kiln at the end of the reduction just to check the
>cones. They are too difficult to see when reducing.
>Marcia in Montana
>
>Marcia: If you want to see the cones in a reducing kiln, just shut the gas
to just about off and it will clear so you can see what's happening. It
helps to blow into the peep hole.
DZeigfinge@aol.com on sun 21 apr 96
I almost never clear my kiln upon reaching ^ 10-11, only unless I have
difficulty seeing the cones. I'm very protective of my reduction atmosphere.
J. Kirk at Glen Echo Park, MD
Arturo Devitalis on sun 21 apr 96
It is always a challange for me to "soak" at the end of a cone 10
firing...sometimes it is like trying to stop the battleship Missouri...the
temp continues to climb even with reduced flame/air & with a few glazes this
can give a messy overfire. Smaller loads act the same way as full loads.
Fascinating stuff this reduction firing. So many things seem to bear on
soak/temp/time. Any comments or war stories to share out there?
--
Arturo DeVitalis
arto@uhura.cc.rochester.edu
Tim Roberts on mon 22 apr 96
Before yesterday all the high fire gas kilns at East Tenneessee State have
been reduced all the way to cone 10. Yesterday I oxidized from cone 8 to cone
10. Tomorrow I'll open it and see the difference, better or worse. I'll let
you know.
Tim Roberts
Johnson City, TN
Erin Hayes on wed 24 apr 96
We always cleared the atmosphere for about 10 minutes before then end of
the firing...
=============================================================================
Erin Hayes, Art and Humanities Instructor Office: (509) 575-2418
Yakima Valley Community College E-mail: ehayes@ctc.edu
PO Box 1647
Yakima, WA 98907 "Clay is Good."
=============================================================================
Tim Roberts on sat 27 apr 96
Hi all,
I'm finally letting you know how the oxidation worked from cone 8 - 10 here at
East TN State. The origional firing didn't turn out very well. Just as I
was getting into body reduction a storm hit. Tornado warnings and very hard
rain and wind. I had wild fluctuations in reduction. Needless to say some of
the coppers were green. However, being the end of the semester we had plenty
of pots to do another firing. This time the weather was perfect and the
firing went fine. I could not notice any difference in any of the colors,
but there wasn't any celadons in it. The kiln is a cart kiln down draft with
four forced air burners. I estimate it to be about 40 cu.ft. I believe the
kiln oxidizes itself after a reduction firing. The top end oxidation dosen't
make a difference.
One more week and the semester is over!
Tim Roberts
ETSU, Johnson City, TN
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