Fonda Hancock on wed 30 jun 04
I just unloaded my kiln (cone 6 electric). The kiln sitter shut it down
but on the opposite side of the same shelf the witness cone showed that it
did not quite reach temp. As I mixed the two glazes two or three days ago
I started in on a new bag of wolla. and it was pebbly and hard to break
up. I finally did get it all through the sieve but it was alot of work!
The rasp is not as clear and bright and the same with the light stormy
blue. Is it probably more likely a factor of the kiln temp not getting up
far enough. I did soak it a good long time and backed it down slowly. Or
could it be the wolla. in which case I'll want to make new glaze. any
ideas?
Fonda,in Tenn. where it is quite pleasant for nearly July
Catherine Yassin on thu 1 jul 04
In a message dated 6/30/2004 1:04:52 PM Central Daylight Time,
fhancock@PEOPLESTEL.NET writes:
> The rasp is not as clear and bright and the same with the light stormy
> blue. Is it probably more likely a factor of the kiln temp not getting up
> far enough. I did soak it a good long time and backed it down slowly. Or
> could it be the wolla. in which case I'll want to make new glaze. any
> ideas?
>
Hi Fonda! I have found that the Raspberry does better at a higher temp. I put
a ^7 bar in my sitter when I'm firing Rasp. glaze and after all is said and
done and soaking and going by the witness cones when I get to a good ^7 the
Rasp. is shiny and more clear. Thats not to say the Rasp. doesn't look good at a
^6, and I've even had some Rasp. pieces in a cools spot in my kiln that didn't
get a full ^6 and they weren't bad. They were just duller, more matt. But for
the results I want, I like Rasp. fired in a hotter kiln.
As for the problem you had with your hard and lumpy Wollastonite... (I did
see your later remark that you didn't put the Wolla. in the Rasp.) I have found
that with some chemicals, like Cornwall Stone, if i put them in a ceramic bowl
(like a seconds) and use one of my broken spy hole stoppers I can crush the
hard lumps into finer pieces. That way the sifting of the wet glaze isn't so
laborious.
-Cat Yassin
San Antonio
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