Burness Speakman on sat 4 oct 03
What's everyones opinion? I want to do two stones with one bird. Bisque and
a glaze firing. All I want to know about is the bisquit firing not the
glaze aspects.
Bunny
william schran on sun 5 oct 03
Bunny wrote: > I want to do two stones with one bird. Bisque and
a glaze firing. All I want to know about is the bisquit firing not the
glaze aspects<
One can do a bisque firing at any temperature. Mass production
industry often does a high bisque and a lower fire glaze. If one
hardens or vitrifies the ware such that the water in the glaze will
not be absorbed into the clay, then a gum binder is often added to
the glaze to help adhere it until the water evaporates.
Bill
Donald G. Goldsobel on sun 5 oct 03
I have read, I don't recall where, that during the bisque fumes from the
burn off of organics can contaminate the glazes. I have fired simgle fire
and bisqued in the same firing with no obvious changes.
Donald
----- Original Message -----
From: "Burness Speakman"
To:
Sent: Saturday, October 04, 2003 1:57 PM
Subject: Bisque at ^1
> What's everyones opinion? I want to do two stones with one bird. Bisque
and
> a glaze firing. All I want to know about is the bisquit firing not the
> glaze aspects.
>
> Bunny
>
>
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Snail Scott on sun 5 oct 03
At 04:57 PM 10/4/03 -0400, you wrote:
>...I want to do two stones with one bird. Bisque and
>a glaze firing...
Sure. A one-shot firing is just like a bisque
firing, nice and slow until red heat is reached,
or whatever cone you have found desirable to
ensure good burnout for your work and clay body.
Then the firing can proceed just as though you
are firing bisqued work, since after all, you
are!
-Snail
Earl Brunner on sun 5 oct 03
My only question would be, at cone 1 is your bisque then porous enough
to glaze?
-----Original Message-----
From: Clayart [mailto:CLAYART@LSV.CERAMICS.ORG] On Behalf Of Snail Scott
Sent: Sunday, October 05, 2003 8:25 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: Bisque at ^1
At 04:57 PM 10/4/03 -0400, you wrote:
>...I want to do two stones with one bird. Bisque and
>a glaze firing...
Sure. A one-shot firing is just like a bisque
firing, nice and slow until red heat is reached,
or whatever cone you have found desirable to
ensure good burnout for your work and clay body.
Then the firing can proceed just as though you
are firing bisqued work, since after all, you
are!
-Snail
Snail Scott on mon 6 oct 03
At 04:57 PM 10/4/03 -0400, you wrote:
>>>...I want to do two stones with one bird. Bisque and
>>>a glaze firing...
Snail replied:
>>Sure. A one-shot firing is just like a bisque
>>firing, nice and slow until red heat is reached...
At 01:30 PM 10/5/03 -0700, you wrote:
>My only question would be, at cone 1 is your bisque then porous enough
>to glaze?
Usually if I am doing a one-shot firing, I've
already applied whatever the final fired surface
(glaze, engobe, oxide, etc) will be. So it's
usually the only firing that piece gets. (Hence
the term 'one-shot'.) Sometimes I'll 'tweak' it
a bit, and add a little something, but not much.
If I do, I usually heat the piece and maybe add
a little gum to whatever I'm applying. I never
dip-glaze, so my glazes are normally kept
brushably thick anyway.
(Did I misunderstand your original question? I
thought you were combining glaze firing and
bisque, but did you mean just having both types
of work in the kiln together, rather than
combining both processes into one firing?)
Note that porosity at ^1 will depend entirely on
the clay body. A ^10 body may be porous enough
to require only slight modifications to your
usual technique. If it's a ^1 body, though,
you'll probably need to use one of the many
methods of glazing vitrified clay that have
been mentioned here and elsewhere. But why
apply your surfaces afterward, when you can
save so much time and money by one-shot firing?
There are many reasons to bisque first, such
as if your preferred surfaces are sensitive
to the outgassing from greenware, or don't
apply well to green clay, or if the work is too
fragile to glaze without excessive damage, etc,
etc. But if you are firing it straight to ^1
for the sake of some hoped-for efficiency, why
not just one-shot the stuff if possible?
-Snail
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