Christine Barros on fri 9 aug 02
I'm posting this for my studio owner, We've been using floating blue for a
few years now with good success( well as great as it is) firing in a Scutt
1027 to cone 6 (maybe sometimes less) manual with kiln sitter. Recently got
new Bailey's kiln (about 12 CUFT) with computer control and kiln sitter. The
cone 6 witness cone is at 3 o'clock and the floating blue is turning green.
Can anyone tell me why this is happening? any suggestions on correcting the
problem?
Thanks,
Christine
Christena Schafale on fri 9 aug 02
Christine,
I suspect that your new kiln cools much slower than your old one -- doesn't
the Bailey have double insulation? Did it take longer before you could
unload than you are used to??
FB doesn't like a slow cool, and will tend to turn green under those
conditions. If you are firing a whole load of FB, or if your other glazes
will tolerate a faster cool-down, I would suggest pulling some peeps to get
things to cool more quickly, especially from top temp down to about 1800
(?) or so.
Chris
At 09:01 AM 8/9/02 -0400, you wrote:
>I'm posting this for my studio owner, We've been using floating blue for a
>few years now with good success( well as great as it is) firing in a Scutt
>1027 to cone 6 (maybe sometimes less) manual with kiln sitter. Recently got
>new Bailey's kiln (about 12 CUFT) with computer control and kiln sitter. The
>cone 6 witness cone is at 3 o'clock and the floating blue is turning green.
>Can anyone tell me why this is happening? any suggestions on correcting the
>problem?
>
>Thanks,
>Christine
>
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william schran on fri 9 aug 02
Christine wrote: "... the floating blue is turning green.
Can anyone tell me why this is happening? any suggestions on correcting the
problem?"
I have found floating blue, or any of the other names this glaze goes
by, will come out different depending on cooling cycle. In a smaller
2 1/2" walled kiln that cools rather fast, it comes out blue. In a
larger 3" wall kiln, fired to same witness cone, approx. same firing
time, but slower cooling, it comes out greenish. This happens with
same glaze batch and same clay body.
Bill
Jim V Brooks on sat 10 aug 02
I fire a Paragon electric kiln with 3"brick..and it cools slowly. A firing
to cone 6 can easily take 40 hours if i dont vent the kiln..AND, my floating
blues come out great.. If i want it green. i refire it in a smaller kiln to
cone 06..It has always worked so far.. So,, about the fast cooling?
Oh Yes, if i decide i dont want it green..i just include it in my next cone 6
firing..and it is again blue.. SO keep looking.. it may not be a slow cool
down....
Jim in Denton
Ruth Ballou on sat 10 aug 02
Jim,
Is is also slow to reach ^6?
Ruth
>I fire a Paragon electric kiln with 3"brick..and it cools slowly. A firing
>to cone 6 can easily take 40 hours if i dont vent the kiln..AND, my floating
>blues come out great.. If i want it green. i refire it in a smaller kiln to
>cone 06..It has always worked so far.. So,, about the fast cooling?
>
>Oh Yes, if i decide i dont want it green..i just include it in my next cone 6
>firing..and it is again blue.. SO keep looking.. it may not be a slow cool
>down....
>
> Jim in Denton
>
>______________________________________________________________________________
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at
>melpots@pclink.com.
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