Talbott on fri 8 aug 97
I am looking for advice on oxidation / reduction cycles that some may use
successfully in firing ^9/10 reduction... when firing for copper reds.. I
sometimes have the copper to volatize off of some of the pots... I want to
likewise reduce this volatizing.. Any and all advise will be
appreciated....
1ST ANNUAL CLAYARTERS' GALLERY - NAPLES, MAINE (Summer 1997)
http://fmc.utm.edu/~dmcbeth/cag/naples.htm
2nd Annual Clayarters' Gallery details will be forth coming!!!
Celia & Marshall Talbott, Pottery By Celia, Route 114, P O Box 4116,
Naples, Maine 04055-4116,(207)693-6100 voice and fax,(call first)
WBS Live Chat Room, Sat Nites 10 PM EDT & Sun Afternoons at
1 PM EDT Private Room: Clayarters E-MAIL: clupus@ime.net
Nils Lou on sat 9 aug 97
To solve the problem of copper volitilization try spraying a thin coat of
a clear C06 over the copper glaze. Tends to improve the reds too. NL
On Fri, 8 Aug 1997, Talbott wrote:
> ----------------------------Original message----------------------------
> I am looking for advice on oxidation / reduction cycles that some may use
> successfully in firing ^9/10 reduction... when firing for copper reds.. I
> sometimes have the copper to volatize off of some of the pots... I want to
> likewise reduce this volatizing.. Any and all advise will be
> appreciated....
>
> 1ST ANNUAL CLAYARTERS' GALLERY - NAPLES, MAINE (Summer 1997)
> http://fmc.utm.edu/~dmcbeth/cag/naples.htm
> 2nd Annual Clayarters' Gallery details will be forth coming!!!
>
> Celia & Marshall Talbott, Pottery By Celia, Route 114, P O Box 4116,
> Naples, Maine 04055-4116,(207)693-6100 voice and fax,(call first)
> WBS Live Chat Room, Sat Nites 10 PM EDT & Sun Afternoons at
> 1 PM EDT Private Room: Clayarters E-MAIL: clupus@ime.net
>
James Dapogny on sat 9 aug 97
Marshall,
First of all, I am far from an expert. But in our Potters' Guild, we are
constantly facing the task of trying to please a large group of people.
So, everything is a compromise. However...
We start reduction (in our JT Abernathy-built 70 cubic feet kiln) gently at
cone 012,and continue it moderately. During the 1900s, we make sure that
the reduction flame, though not huge, is steady and not wimpy since that
seems to be the period during which the oxides etc.are being affected. When
cone 9 is roughly half over, we begin the soak: i.e. we turn back the gas
a bit so that the temp doesn't take off, but also doesn't drop. On the
average, the soak temp is about 2280f, give or take 10-15 degrees. We aim
for an hour and a half soak, and often attain it or at least are close.
We turn off when 9 is long past over and 10 is anywhere from very soft to
half over.
Within this scenario, we seem to get good color,including copper reds
(although not with rock solid reliability), and a reasonable degree of
clarity within the glaxe texture. Iron reds are generally quite good.
(You can see that in the pots of mine that you have; my personal bias runs
to iron reds rather than copper.)
Anyway...we used to oxidize during the soak, but now we figure that we get
enough oxidation through the burner ports just after the kiln is turned
off. In any case, our copper reds improved when we did away with the long
oxidation periods.
Don't know if this is at all helpful; I will be be really interested in
what others have to say, particularly Nils..
--Gail Dapogny, Ann Arbor Potters' Guild
Chris Trabka on sat 9 aug 97
Talbott wrote:
>
> ----------------------------Original message----------------------------
> I am looking for advice on oxidation / reduction cycles that some may use
> successfully in firing ^9/10 reduction... when firing for copper reds.. I
> sometimes have the copper to volatize off of some of the pots... I want to
> likewise reduce this volatizing.. Any and all advise will be
> appreciated....
>
> 1ST ANNUAL CLAYARTERS' GALLERY - NAPLES, MAINE (Summer 1997)
> http://fmc.utm.edu/~dmcbeth/cag/naples.htm
> 2nd Annual Clayarters' Gallery details will be forth coming!!!
>
> Celia & Marshall Talbott, Pottery By Celia, Route 114, P O Box 4116,
> Naples, Maine 04055-4116,(207)693-6100 voice and fax,(call first)
> WBS Live Chat Room, Sat Nites 10 PM EDT & Sun Afternoons at
> 1 PM EDT Private Room: Clayarters E-MAIL: clupus@ime.net
I fired a small (12 cubic foot) updraft kiln quite evenly using the
following firing schedule: oxidation to ^015, light reduction (1" to no
more
than 2" of back preassure out of the bottom peep) till ^06, 45 minutes
of hard reduction (2" to no more than 3" of back preassure out of the
bottom peep), return to light reduction for the remainder of the firing.
(With a warming period I used about 1800 cubic feet of gas for this ^10
(high reduction) firing.
One Note: I found that I could NOT place any pots containg red glazes
close to the burners - the glaze was always clear (only did that a few
times). In the center of the kiln top to bottom the reds were
consistent.
Chris
Talbott on sun 10 aug 97
Nils... Thanks for the advice... why a ^06 glaze? ..Marshall
PS.. I just saw a doe (whitetail) with triplets feeding on grass behind the
kiln!
----------------------------Original message----------------------------
To solve the problem of copper volitilization try spraying a thin coat of
a clear C06 over the copper glaze. Tends to improve the reds too. NL
1ST ANNUAL CLAYARTERS' GALLERY - NAPLES, MAINE (Summer 1997)
http://fmc.utm.edu/~dmcbeth/cag/naples.htm
2nd Annual Clayarters' Gallery details will be forth coming!!!
Celia & Marshall Talbott, Pottery By Celia, Route 114, P O Box 4116,
Naples, Maine 04055-4116,(207)693-6100 voice and fax,(call first)
WBS Live Chat Room, Sat Nites 10 PM EDT & Sun Afternoons at
1 PM EDT Private Room: Clayarters E-MAIL: clupus@ime.net
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