Rod, Marian, and Holly Morris on tue 2 may 00
------------------
Noting the discussion of single firing I must ask=21 Is there anyone out =
there
single firing in the lo-fire ranges? I have experimented and had big =
problems
with this- The clay cracking from absorbing too much water from the glaze, =
and,
if applied leather hard clay, then the glaze bubbling and failing to mature,=
to
name the two biggest problems.
BUT what school instructor wouldn't love to only have to single fire to get =
a
good result, SO if YOU know of a good recipe for single fired glazing of
earthenware PLEASE don't hold back=21
And for the sake of the conversation, I have successfully (electric) single
fired =5E6 porcelain type clay with clear glaze. I applied it to leather =
hard
clay.
Marian in Michigan where spring has sprung=21
Jeff Lawrence on wed 3 may 00
Hello,
Some repeatable phenomena at cone 04 with white earthenware:
- Open bodies are more forgiving, more plastic ones less so.
- Gas firing works better than electric -- I've put wet pots in with nary a
blow, as long as I gave it a slow hour. I figure the dynamic atmosphere
wicks away the moisture evenly.
A quizzical phenomenon: most of my slipcast light fixtures misbehave in
single-firing. The single-fired pieces are prone to slumping while the
bisqued ones maintain their shape. Same clay, same glazes. My best guess is
that the clay in sintering is weaker than post-sintering, and that the
weight of the glaze presses it down. Other guesses, please!
Jeff Lawrence ph. 505-753-5913
Sun Dagger Design fx. 505-753-8074
18496 US HWY 285/84 jml@sundagger.com
Espanola, NM 87532 www.sundagger.com
Don Jones on wed 3 may 00
Marian,
I did some experimentation on this for quite a while. First of all, all of
my thrown closed forms are once-fired lo fired ware (cone 05) I spray on
all the underglaze and hand decorate the designs and then spray on a THIN
coating of clear overglaze. These come out quite nice, semi-mat and a
little rough. I have been selling these for 6 years and make a nice living
at it.
Recently, I have tried to once fire my tiles. The only success I have had
is to brush on 2 layers of overglaze and fire. 3 layers causes bubbling. 1
layer is not quite enough but 2 makes a nice orange peel effect. I am not
going to continue doing this but it is interesting. I am realy sure it will
depend on the type of clay and the formula for your glaze. All my stuff is
off the shelf . I had my supplier custom make a lo fire body for me using
wallastonite and a little sand added to a standard 04 body.
Don Jones
http://www.highfiber.com/~claysky
----------
>From: "Rod, Marian, and Holly Morris"
>To: CLAYART@LSV.UKY.EDU
>Subject: Can you single fire lo-fire work?
>Date: Tue, May 2, 2000, 12:49 PM
>
>----------------------------Original message----------------------------
>------------------
>Noting the discussion of single firing I must ask! Is there anyone out there
>single firing in the lo-fire ranges? I have experimented and had big problems
>with this- The clay cracking from absorbing too much water from the glaze, and,
>if applied leather hard clay, then the glaze bubbling and failing to mature, to
>name the two biggest problems.
>
>BUT what school instructor wouldn't love to only have to single fire to get a
>good result, SO if YOU know of a good recipe for single fired glazing of
>earthenware PLEASE don't hold back!
>
>And for the sake of the conversation, I have successfully (electric) single
>fired ^6 porcelain type clay with clear glaze. I applied it to leather hard
>clay.
>
>Marian in Michigan where spring has sprung!
>
Kathryn L Farmer on fri 5 may 00
Trapped moisture within a smaller space???
Kathryn
----- Original Message -----
From: "Jeff Lawrence"
To:
Sent: Wednesday, May 03, 2000 4:05 PM
Subject: Re: Can you single fire lo-fire work?
> ----------------------------Original message----------------------------
> Hello,
>
> Some repeatable phenomena at cone 04 with white earthenware:
>
> - Open bodies are more forgiving, more plastic ones less so.
>
> - Gas firing works better than electric -- I've put wet pots in with nary
a
> blow, as long as I gave it a slow hour. I figure the dynamic atmosphere
> wicks away the moisture evenly.
>
> A quizzical phenomenon: most of my slipcast light fixtures misbehave in
> single-firing. The single-fired pieces are prone to slumping while the
> bisqued ones maintain their shape. Same clay, same glazes. My best guess
is
> that the clay in sintering is weaker than post-sintering, and that the
> weight of the glaze presses it down. Other guesses, please!
>
> Jeff Lawrence ph. 505-753-5913
> Sun Dagger Design fx. 505-753-8074
> 18496 US HWY 285/84 jml@sundagger.com
> Espanola, NM 87532 www.sundagger.com
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