Connie Christensen on wed 2 jun 04
mel wrote:
> i have to do a shino for kurt...we are doing
> a giant pot at the farm.
>
> now, what shino to make?
> and, ......., connie c in colorado is having
> trouble....what to do?
>
At the end of June, I get to take my bubbled shino to the man himself - 5
days with Malcolm. Shino heaven. Talking and testing shinos. I'm taking time
out of the studio to attend the workshop, not to many things can get me out
of the studio for 5 days.
After reading David Beumee's post, maybe it's the recycled porcelain. A few
clayart members also gave me some ideas about what could be causing the
problem. Since moving my studio in March, I've been firing in the Arvada
Center kiln until mine was ready to fire again (those firings turned out
fantastic with no bubbles, which sort of shoots down the recycled clay
theory). I just fired my kiln for the first time last week with a new stack
(it had no stack before) and a broken oxyprobe and the firing was not
exactly what I wanted.
Fortunately I take good notes while firing and the next one without the
probe should be ok. I called Axner today, they don't think my oxyprobe can
be fixed - the wire broke at the base, that means getting a new one. Bummer.
They will take a look at it though and try to fix it. The base is glued on
and they have to take it off to get to the wire, unscrewing the glued base
may break it so it's totally unfixable. So tomorrow I pack it up, ship it
and hope for the best.
I'll be sure to post what Malcolm thinks the bubbling problem is and/or what
actually solves the problem whenever that happens. Sometimes progress is
very slow.
Connie Christensen
Arvada, CO
www.conniechristensen.com
mel jacobson on wed 2 jun 04
i have so many shino recipes that i no longer
have a clue what to make?
i have to do a shino for kurt...we are doing
a giant pot at the farm.
now, what shino to make?
and, my hero, connie c in colorado is having
trouble....what to do?
in my magic bubble pix. (see below)
two guys at a clay company, stoned.
`hey, did you put 5 bags of goldart in that
batch or six?`
`who knows? i think seven?
it does not matter a bit, it is for
some dumb potter.`
i watched that happen one time a few
years back. won't tell you what state i was in.
(but, not stoned myself.)
From:
Minnetonka, Minnesota, U.S.A.
web site: my.pclink.com/~melpots
or try: http://www.pclink.com/melpots
new/ http://www.rid-a-tick.com
Gail Dapogny on thu 3 jun 04
Hi Connie and everyone with shino antennae up:
I saw Malcolm recently at a two-day workshop here and he had brought
along a box full of "failed" pots that he had just fired in Jeff
Oestreich's kiln. They were failed in that they were pure white and
bubbled. The white he understood: at the time of the firing, there
were fans blowing all over and maybe winds as well, and he was unable
to control the atmosphere enough to keep from oxidizing. But the
bubbles were puzzling. He thought maybe cooling too fast, but wasn't
at all sure. I took a few pots to experiment on. The first --totally
white and very bubbled -- I put into a small (25 cub ft) reduction
kiln we fired with JT using his brand new oxyprobe. That kiln has 4
great big burners (it's a JT kiln), and we were having trouble with the
gas/air mix. I stayed out and babysat it the whole time. The kiln was
determined to reduce ASAP. By 1420 f , the oxyprobe was at 88 (!), and
stayed around there for a couple of hours. Then it was in the 70s for
a while, and finally the 60s during the last hour. (This might not be
relevant but thought you might want to know.) A 5-hour firing to cone
9.
Anyway -- the pot: the bubbles remained, but trapped a lot of carbon.
No orange. Malcolm was surprised at the carbon trapping in a refire,
but disappointed that the bubbles remained. I'm a fledgling, but
speculated that the bubble edges were so sharp they were able to trap
more carbon even in the refire.
(Pots with Pete Pinnell's red-orange were blood red incidentally. )
Another pot -- pure white and smaller, less obtrusive bubbles: I put
this one in our large (95 cub ft) kiln during a normal cone 10
reduction firing--reduction starts at 012 and continues to the end
moderately. The bubbles totally disappeared, and the pot took on soft
orange color in places.
I've been e-mailing back and forth with Malcolm, and now at his
suggestion I think I'm going to try sanding the bubbles lightly on the
first pot and put it back in our large kiln to see what happens.
I'll keep you posted with further experiments with the attack on the
bubbles, if you like. Also would be interested -- as would Malcolm --
in any and all suggestions. Lucky you: 5 days!!
Gail Dapogny in Ann Arbor
On Jun 2, 2004, at 12:19 PM, Connie Christensen wrote:
>
> At the end of June, I get to take my bubbled shino to the man himself
> - 5
> days with Malcolm. Shino heaven. Talking and testing shinos. I'm
> taking time
> out of the studio to attend the workshop, not to many things can get
> me out
> of the studio for 5 days.
>
> After reading David Beumee's post, maybe it's the recycled porcelain.
> A few
> clayart members also gave me some ideas about what could be causing the
> problem. Since moving my studio in March, I've been firing in the
> Arvada
> Center kiln until mine was ready to fire again (those firings turned
> out
> fantastic with no bubbles, which sort of shoots down the recycled clay
> theory). I just fired my kiln for the first time last week with a new
> stack
> (it had no stack before) and a broken oxyprobe and the firing was not
> exactly what I wanted.
>
> Fortunately I take good notes while firing and the next one without the
> probe should be ok. I called Axner today, they don't think my oxyprobe
> can
> be fixed - the wire broke at the base, that means getting a new one.
> Bummer.
> They will take a look at it though and try to fix it. The base is
> glued on
> and they have to take it off to get to the wire, unscrewing the glued
> base
> may break it so it's totally unfixable. So tomorrow I pack it up, ship
> it
> and hope for the best.
>
> I'll be sure to post what Malcolm thinks the bubbling problem is
> and/or what
> actually solves the problem whenever that happens. Sometimes progress
> is
> very slow.
>
> Connie Christensen
> Arvada, CO
> www.conniechristensen.com
>
> _______________________________________________________________________
> _______
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>
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>
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> melpots@pclink.com.
Connie Christensen on thu 3 jun 04
Gail wrote:
> Anyway -- the pot: the bubbles remained, but trapped a lot of carbon.
> No orange. Malcolm was surprised at the carbon trapping in a refire,
> but disappointed that the bubbles remained. I'm a fledgling, but
> speculated that the bubble edges were so sharp they were able to trap
> more carbon even in the refire.
>
Gail, when I've refired, the bubbles usually smooth out ok but I've never
gotten more carbon trapping. The actually turn out very nice when refired.
Connie Christensen
Arvada, CO
www.conniechristensen.com
Donald Goldsobel on thu 3 jun 04
I did a workshop with Malcolm that Gail D. attended. We had a semi
successful firing in a 40 foot updraft. One of my porcelain pots came out
with what were obviously flattened bubbles. The pot is great . It looks like
a leopard in places. It had a streak of orange and a patch or two of white.
None of the pots nearby had any where near the same result. None of the pots
bubbled. I think that the firing schedule has to be individual to this
particular glaze and the kiln. One schedule for that glaze does not seem to
work in all kilns..
Donald
----- Original Message -----
From: "Gail Dapogny"
To:
Sent: Thursday, June 03, 2004 7:14 AM
Subject: Re: shino worry
>
Lee Love on fri 4 jun 04
Connie Christensen wrote:
>Gail, when I've refired, the bubbles usually smooth out ok but I've never
>gotten more carbon trapping. The actually turn out very nice when refired.
>
>
I have put frit in the bubbles after breaking the surface with
sandpaper or a rubbing stone. I have also seen carbon trapping
appearing in the refire.
--
Lee in Mashiko, Japan http://mashiko.org
http://journals.fotki.com/togeika/Mashiko/ Commentary On Pottery
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