Donna Kat on mon 26 nov 07
On Mon, 26 Nov 2007 15:36:31 -0500, Teresa Thompson
wrote:
>I have enjoyed the shared wisdom from this listserve but have only been a
>reader until today.
>
>I have looked through the archives and haven't been able to find an answer
>to my question so I would like to throw it out to the listserv and
>hopefully get some advice.
>
>I would like to single-fire cone 6 clay without using any glaze. Should I
>just extend my bisque fire to the full firing temp or qare there other
>considerations I need to observe? Thanks in advance for any help that is
>offered.
You can certainly fire from green to finished temperature in one firing.
You have to be careful though to go slow at the same points you would in a
bisque fire and the glaze firing. Since you are not concerned about the
finish of the glaze you can do without the soak at peak temperature and and
the ramping down after peak temperature to form matte crystals. So
basically what you are doing is a bisque fire followed a fast glaze fire
which begins from the peak temperature of the bisque.
Donna
Teresa Thompson on mon 26 nov 07
I have enjoyed the shared wisdom from this listserve but have only been a
reader until today.
I have looked through the archives and haven't been able to find an answer
to my question so I would like to throw it out to the listserv and
hopefully get some advice.
I would like to single-fire cone 6 clay without using any glaze. Should I
just extend my bisque fire to the full firing temp or qare there other
considerations I need to observe? Thanks in advance for any help that is
offered.
Frank Colson on tue 27 nov 07
Donna- Just carry your bisque firing on up and through your ^6 peak. It
really is a piece of cake. The obvious barrier is your state of mind,
otherwise it would not have been neceassary to ask! I have done this kind
of firing off and on for decades! Don't think of it as a "bisque" firing in
anyway. It is a one firing, pure and simple!
Frank Colson
----- Original Message -----
From: "Donna Kat"
To:
Sent: Monday, November 26, 2007 4:23 PM
Subject: Re: Single Firing Without Glazing
> On Mon, 26 Nov 2007 15:36:31 -0500, Teresa Thompson
> wrote:
>
>>I have enjoyed the shared wisdom from this listserve but have only been a
>>reader until today.
>>
>>I have looked through the archives and haven't been able to find an answer
>>to my question so I would like to throw it out to the listserv and
>>hopefully get some advice.
>>
>>I would like to single-fire cone 6 clay without using any glaze. Should I
>>just extend my bisque fire to the full firing temp or qare there other
>>considerations I need to observe? Thanks in advance for any help that is
>>offered.
>
> You can certainly fire from green to finished temperature in one firing.
> You have to be careful though to go slow at the same points you would in a
> bisque fire and the glaze firing. Since you are not concerned about the
> finish of the glaze you can do without the soak at peak temperature and
> and
> the ramping down after peak temperature to form matte crystals. So
> basically what you are doing is a bisque fire followed a fast glaze fire
> which begins from the peak temperature of the bisque.
>
> Donna
>
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Snail Scott on tue 27 nov 07
On Nov 26, 2007, at 11:00 PM, Automatic digest processor wrote:
> Date: Mon, 26 Nov 2007 15:36:31 -0500
> From: Teresa Thompson
> Subject: Single Firing Without Glazing
>
> I would like to single-fire cone 6 clay without using any glaze.
> Should I
> just extend my bisque fire to the full firing temp or qare there other
> considerations I need to observe?
You got it! Through the lower temperatures, fire as you
normally would for any greenware of similar thickness
and body composition. When red heat is reached, you
can pretty much go as fast as you care to, or as fast as
your kiln is happy with.
(Technically, any firing without glaze is a 'bisque'
firing, but let's not go there...) ;-)
In most electric kilns, this means a standard bisque
schedule, then leave it on 'high' 'til your chosen cone
drops. In a fuel kiln, I'd keep it fairly slow and oxidizing
until past ^04 or so, since you want a good clean burnout
before beginning body reduction (if any is planned). This
can make single-firing problematic for glazes that need
early reduction, but in your case, since you are using no
glaze, this will not be relevant to you. (Iron-bearing clays
are also more susceptible to black-core from too little
burnout time or too early reduction, or both).
If you are happy with your present bisque schedule, keep
using it for this also, and once you are past that burnout
temperature range, just keep going on up!
-Snail
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