Susan P on tue 28 mar 06
Thought I sent an earlier emai, but did not see it, so here goes again with
the questions - and a bit of context.
!) Am I correct in my understanding that the purpose of the bisque is to
drive off moisture - both physical and chemical?
2) Does the type of clay body dictate at which cone to bisque fire? 04, 05,
06?
3) I have some sculptural work which I have, in the past, (and I am now jus=
t
returning to doing more ceramics now though my clay education is limited)
and I "bisque" fired these porcelain pieces at a very low cone 22 or 18 - s=
o
that I could continue to carve and sand them. So now I wonder, was this
temperature really high enough to be considered a biscuit firing or should =
I
then do a second bisque before the final firing.
SAGGAR [or settter?]
These pieces have very uneven undulating walls and the larger ones were
prone to slumping and collapse. From what I have read, I am beginning to
think that it might be best if I created a saggar for firing them and
perhaps fill it, the saggar, with vermiculite. Hence, the questions are:
1) What kind of clay body is conducive to multiple firing at possible Cone
10 oxidation - what body names/ what constituent ingredients (not practical
to make my own & I am in Pacific Northwest)
2) It would need to be handbuilt so I was assuming slab built? Any
experience on wall thickness or other construction considerations?
Thank you so much.
Susan in Edmonds
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