Helvi Abatiell on fri 31 mar 00
Dear fellow clayarters,
When I started pottery a year and a half ago, I was somehow informed or
informed myself that I should bisque at ^04 and glaze at ^06. Is this
wrong? Could someone tell me why you should bisque lower and glaze higher?
I'm using Duncan's Concept glazes mostly which say to fire at 06.
I occassionally do fire high at ^4 or ^6 and then glaze at ^06 using the
same Concept glazes. Again, I'm firing hotter bisque then glaze.
Can someone shed some lite on the subject for me?
Have I been doing this wrong all the time?
Thanks,
Helvi
Cindy Strnad on sat 1 apr 00
Helvi,
Mid to high fire work should be bisqued at a lower temp and glazed at a
higher temp. Low-fired work is usually bisqued at a higher temperature than
the glaze firing. This has something to do with shrinkage (and maybe gas
release), and is different because low-fire glazes are different. Don't
worry. You're doing it right. Just follow the directions on the glazes (or
not, if you like to experiment).
Cindy Strnad
earthenv@gwtc.net
Earthen Vessels Pottery
RR 1, Box 51
Custer, SD 57730
WHew536674@cs.com on sat 1 apr 00
Helvi,
You aren't doing anything wrong. Rule of thumb is to bisque anything at ^ 05
or 06. The reason being that at that state the pot can absorb the glaze
better. The higher you fire, the more vitrus the pot becomes and the harder
it is for the glaze to soak in.
Joyce A.
Veronica Honthaas on sat 1 apr 00
Count me in as one of those confused souls that does not really understand
bisque temperatures. In college we bisqued our stoneware to come 010 and I
have continued to do this over the years. This worked great for all of our
school glazes plus the old standards like Shaner's, pumpkin, shino. I use
a variety of clays including Rod's Bod and Columbia Red.
Is there a reason I should bisque hotter? Veroncia
At 05:29 PM 3/31/00 EST, you wrote:
>----------------------------Original message----------------------------
>Dear fellow clayarters,
> When I started pottery a year and a half ago, I was somehow informed or
>informed myself that I should bisque at ^04 and glaze at ^06. Is this
>wrong? Could someone tell me why you should bisque lower and glaze higher?
>I'm using Duncan's Concept glazes mostly which say to fire at 06.
> I occassionally do fire high at ^4 or ^6 and then glaze at ^06 using the
>same Concept glazes. Again, I'm firing hotter bisque then glaze.
>
> Can someone shed some lite on the subject for me?
> Have I been doing this wrong all the time?
>
> Thanks,
> Helvi
>
>
Hank Murrow on sun 2 apr 00
Dear Bisque Firing Friends; Here's my take on this; If you encounter a clay
which(after the bisque) doesn't take glaze well, so that the glaze sits wet
on the pot for a long time........Bisque to a lower cone. If you run across
a clay that bloats in the glaze firing; you need to fire your bisque to a
higher cone(or longer) to burn off the carbonaceous or sulphurous material
in the clay. most clays do fine anywhere from C/010 to C/06; "your mileage
may vary". Anyway, that's how I decide the issue. Hope this helps, Hank in
Eugene
----------------------------Original message----------------------------
>
>Count me in as one of those confused souls that does not really understand
>bisque temperatures. In college we bisqued our stoneware to come 010 and I
>have continued to do this over the years. This worked great for all of our
>school glazes plus the old standards like Shaner's, pumpkin, shino. I use
>a variety of clays including Rod's Bod and Columbia Red.
>Is there a reason I should bisque hotter? Veroncia
>
>
>At 05:29 PM 3/31/00 EST, you wrote:
>>----------------------------Original message----------------------------
>>Dear fellow clayarters,
>> When I started pottery a year and a half ago, I was somehow informed or
>>informed myself that I should bisque at ^04 and glaze at ^06. Is this
>>wrong? Could someone tell me why you should bisque lower and glaze higher?
>>I'm using Duncan's Concept glazes mostly which say to fire at 06.
>> I occassionally do fire high at ^4 or ^6 and then glaze at ^06 using the
>>same Concept glazes. Again, I'm firing hotter bisque then glaze.
>>
>> Can someone shed some lite on the subject for me?
>> Have I been doing this wrong all the time?
>>
>> Thanks,
>> Helvi
>>
>>
sibylle on mon 3 apr 00
Hi Hank,
just one short question: what do you mean with "the glaze sits wet for a
long
time"? My glazes are wet for about 1to 2 minutes, is that long enough or
do I
bisque to a lower temperature?
By the way, just another question: C/010 to C/06, does this mean Seger
cone, i.e.
9250C to 9950C. Are american cones equal in temperature as german? I
guess they
are but are not really sure.
Thanks
Sibylle (from Germany)
Hank Murrow schrieb:
> ----------------------------Original
message----------------------------
>
> Dear Bisque Firing Friends; Here's my take on this; If you encounter a
clay
> which(after the bisque) doesn't take glaze well, so that the glaze
sits wet
> on the pot for a long time........Bisque to a lower cone. If you run
across
> a clay that bloats in the glaze firing; you need to fire your bisque
to a
> higher cone(or longer) to burn off the carbonaceous or sulphurous
material
> in the clay. most clays do fine anywhere from C/010 to C/06; "your
mileage
> may vary". Anyway, that's how I decide the issue. Hope this helps,
Hank in
> Eugene
>
>
Cindy Strnad on tue 4 apr 00
Sibylle,
I don't know about the cones, but glazes that dry in one to two minutes are
just fine. As long as your current way of doing things is working, I
wouldn't worry about it at all.
Cindy Strnad
earthenv@gwtc.net
Earthen Vessels Pottery
RR 1, Box 51
Custer, SD 57730
Hank Murrow on tue 4 apr 00
Dear Sibylle; The cone we use over here in the states are Orton cones,
which do vary, I believe, from Seger. Orton cones 010-06 would be roughly
equivalent to 919 C- 1023 C. Seger cones in the same range would be 900
C-980 C. When I say 'wet for a long time', I mean an hour and more, even on
a warmish day. One to two minutes is fine. Thanks for asking, Hank in
Eugene, remembering my visit to Westerwald near Koblenz in '84.
>Hi Hank,
>just one short question: what do you mean with "the glaze sits wet for a
>long
>time"? My glazes are wet for about 1to 2 minutes, is that long enough or
>do I
>bisque to a lower temperature?
>
>By the way, just another question: C/010 to C/06, does this mean Seger
>cone, i.e.
>9250C to 9950C. Are american cones equal in temperature as german? I
>guess they
>are but are not really sure.
>
>Thanks
>Sibylle (from Germany)
>
>
>
>
>
>Hank Murrow schrieb:
>
>> ----------------------------Original
>message----------------------------
>>
>> Dear Bisque Firing Friends; Here's my take on this; If you encounter a
>clay
>> which(after the bisque) doesn't take glaze well, so that the glaze
>sits wet
>> on the pot for a long time........Bisque to a lower cone. If you run
>across
>> a clay that bloats in the glaze firing; you need to fire your bisque
>to a
>> higher cone(or longer) to burn off the carbonaceous or sulphurous
>material
>> in the clay. most clays do fine anywhere from C/010 to C/06; "your
>mileage
>> may vary". Anyway, that's how I decide the issue. Hope this helps,
>Hank in
>> Eugene
>>
>>
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