Cindy on thu 27 feb 97
Hello, Irene.
Oops! In my humble experience, firing your bisque to ^6 is a bad--very bad
move. I had a friend do this "for" me once before I got my own kiln. Then,
last week I overfired a load because I was overtired and inserted the wrong
cone. Fortunately, I discovered this gaffe before it had gotten all the way
up to ^6, but it was hot enough to cause trouble.
Overfired bisque doesn't slurp up the glaze like the porous stuff. You have
to apply one coat, then let it dry (maybe even overnight) before you give
it the second dip (or whatever your method is.) The possibility of a thin
coat is high, as is the possibility of having glaze crawl off the
pots--just depends on the glaze, I suppose. The first experience was a
total bust. The second one gave me a load of beautiful stuff which I'll
probably never be able to quite duplicate. (Except, of course, for the
platter which I needed for a special order--that was ruined, naturally.)
Hope this helps, and I'll be eagerly watching for the replies of the more
experienced.
Cindy
Dave/Janice Schiman on fri 28 feb 97
I have had this happen also and had some success by heating up the
pottery pieces before applying glazes.
Janice Schiman
Moose Jaw, Sask.
Cindy wrote:
>
> ----------------------------Original message----------------------------
> Hello, Irene.
>
> Oops! In my humble experience, firing your bisque to ^6 is a bad--very bad
> move. I had a friend do this "for" me once before I got my own kiln. Then,
> last week I overfired a load because I was overtired and inserted the wrong
> cone. Fortunately, I discovered this gaffe before it had gotten all the way
> up to ^6, but it was hot enough to cause trouble.
>
> Overfired bisque doesn't slurp up the glaze like the porous stuff. You have
> to apply one coat, then let it dry (maybe even overnight) before you give
> it the second dip (or whatever your method is.) The possibility of a thin
> coat is high, as is the possibility of having glaze crawl off the
> pots--just depends on the glaze, I suppose. The first experience was a
> total bust. The second one gave me a load of beautiful stuff which I'll
> probably never be able to quite duplicate. (Except, of course, for the
> platter which I needed for a special order--that was ruined, naturally.)
>
> Hope this helps, and I'll be eagerly watching for the replies of the more
> experienced.
>
> Cindy
Debby Grant on fri 28 feb 97
Hi Irene, Not fun to over fire bisque and causes a lot of work. The first
thing
you will have to do is to thicken your glazes. Let the glaze settle and
scoop out the top water and set it aside to readd to the glaze later. Then
mix your glaze and
pour back some of the water until it is the consistancy of heavy cream or a
little thicker. Next heat your pots so that you can just about touch them.
Do
not wax the bottoms as the wax will melt. You will just have to scrape and
sponge
off the glaze on the feet after dipping. This is the same method I use to
reglaze fired glazed pots and works even better on over fired bisque.
Good luck, Debby Grant.
Dave and Pat Eitel on sat 1 mar 97
>----------------------------Original message----------------------------
>Hi Irene, Not fun to over fire bisque and causes a lot of work. The first
>thing
>you will have to do is to thicken your glazes. Let the glaze settle and
>scoop out the top water and set it aside to readd to the glaze later. Then
>mix your glaze and
>pour back some of the water until it is the consistancy of heavy cream or a
>little thicker. Next heat your pots so that you can just about touch them.
> Do
>not wax the bottoms as the wax will melt. You will just have to scrape and
>sponge
>off the glaze on the feet after dipping. This is the same method I use to
>reglaze fired glazed pots and works even better on over fired bisque.
>Good luck, Debby Grant.
Overfired bisque must happen to everyone sooner or later. At first I used
to glaze it similar to what's suggested here--it works, but it's slow,
slow, slow and often the pots just aren't right after they're fired. Once
I went completely nuts and just trailed some designs on the pots with thick
glaze--like slip trailing. There was no other glaze on them and after
they were glaze-fired, they looked like they were "supposed" to look that
way. Another time I just trashed all the overfired pots. It only took a
few minutes.
Later...Dave
Dave Eitel
Cedar Creek Pottery
Cedarburg, WI
pots@cedarcreekpottery.com
http://www.cedarcreekpottery.com
Judy Musicant on sun 16 apr 06
Marianne,
I wouldn't characterize your bisque load as overfired. At most, it =
sounds like some of your ware got closer to ^04 than ^05. Many people =
deliberately bisque to 04. The problem's start when the bisque gets =
much closer
to the glaze temperature and the pots are so vitrified you can't get =
sufficient glaze to stick. With the pots in the load you describe, you =
should hardly notice any difference.
Judy Musicant
Mountainview Pottery
Marianne Kuiper Milks wrote:
"My last bisque load, ^05, was 75% overfired. Bottom cones were still =
standing but the top/mid ones were about flat. Clearly I'll have to =
reconfigure the position of the shelves.
The question: can I still safely glaze and fire at ^6? Is there a =
problem glazing over-fired ware? Anything I can do to improve my =
chances? It was a rather large load - hate to toss it."
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