Paul Herman on fri 9 may 03
Hello Nancy,
Well, since they came out fine, there's no disadvantage.
Lots of stuff is single fired, from pots to bricks to toilets. I've done
some raw glazing, and there are things you can't do, like scrubbing the
glaze off and doing it over, etc. But there are some techniques that
work.
A good book on the subject is by Dennis Parks, "A Potter's guide to
Raw Glazing and Oil Firing". I think Axner has it. The method Dennis
explains in the book is the same one you used, glazing bone dry
greenware.
I went to the Tuscarora Pottery School for two weeks and did single
firing there. It's very direct, you make the stuff, dry, glaze and fire.
There are a few items I make that are routinely single fired, but mostly
unglazed ones like mortar and pestle sets. Next salt firing I'll try
some greenware.
Good luck,
Paul Herman
Great Basin Pottery
423-725 Scott Road
Doyle, California 96109 US
potter@psln.com
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>From: nancy patterson
>To: CLAYART@LSV.CERAMICS.ORG
>Subject: one step firing
>Date: Fri, May 9, 2003, 1:04 PM
>
> I am confused about the one firing method (no bisque)
> I was doing a glaze firing of brown cone 6 clay
> and had a few bone dry little tea bowls or small sake cups
> and just dipped them in the licorice glaze twice and they
> fired fine. What are the disadvantages to this?
> Thanx,
> Nancy
nancy patterson on fri 9 may 03
I am confused about the one firing method (no bisque)
I was doing a glaze firing of brown cone 6 clay
and had a few bone dry little tea bowls or small sake cups
and just dipped them in the licorice glaze twice and they
fired fine. What are the disadvantages to this?
Thanx,
Nancy
Snail Scott on sun 11 may 03
At 04:04 PM 5/9/03 -0400, you wrote:
>I am confused about the one firing method (no bisque)
...What are the disadvantages to this?
>Thanx,
>Nancy
I often single-fire my work, but when I choose to do a
bisque, here are some of the reasons:
Some clays react badly to being re-wetted during the
glazing process, and try to disintegrate.
Some glazes don't 'fit' well, lacking sufficient clay in
their composition to shrink along with the piece during
firing.
Some glazes respond badly to the outgassing that occurs
when green clay is fired, and can change color.
Some work is too delicate or awkwardly shaped to be safe
to handle during glazing, unless already bisqued.
If I am doing a series of things that I want to match,
I'd rather glaze them at the same time, but my studio is
too small to have fragile greenware sitting around.
Bisque lets me store the first pieces with less caution,
until the later pieces are complete.
I often do large work, and multi-part pieces are easier
to 'true up' between the sections if they are bisqued
and safer move around, roll over, etc. to work on the
former bottom sides.
Single-fire is still preferable to me when possible,
though, as it saves time and money spent on firing.
-Snail
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