Rimas VisGirda on sat 14 aug 10
James wrote:
Think of the glass as
a very low fire glaze, which is essentially what it is. What happens
when you run a typical low fire glaze up to cone 6? I think you will
end up with a lot of frozen, broken bubbles with very sharp edges, but
that is just a guess.
James, Randy, In my 2 experiences, no broken bubbles or sharp edges.
In high school ceramics class we made some "ashtrays" -a chunk of clay abou=
t 8x8x1 inch thick. This chunk was hollowed out and broken coke bottle glas=
s put in the hollow; fired to (probably) c/05. The result was a crazed 3/8 =
in thick layer of glass, quite beautiful if you like the polished rock sort=
of aesthetic. No annealing...
At a symposium Yih-Wen Kuo cut some depressions about 0.5x1 in square and p=
acked them with broken window glass and some cobalt. Fired to c/13. The res=
ult was blue glass running out of the depressions down the side of the piec=
e -not enough glass mass to make it to the bottom.
In the 60's or 70's it was popular to "stretch" Pepsi and Coke bottles by s=
uspending them in a kiln and firing until the bottle stretched and touched =
down to the shelf, I would guess about c/018-017. No annealing necessary.
I fire decals onto window glass laying flat on the kiln shelf to c/018. The=
glass takes on the texture of the kiln shelf, no annealing necessary... If=
I fire upright glass objects I find that they can slump at 018, fired to 0=
20 they stay upright. No annealing necessary.
I think a bunch of glass in the bottom of a bowl at c/6 will just melt and =
form a lake of glass -be careful of bowls that might develop an s crack, mo=
lten glass running over the kiln shelves and kiln floor and whatever is und=
erneath is no fun...
-Rimas
James Freeman on sat 14 aug 10
It seems my writing was unclear. The talk of annealing was on the
assumption that Randy wanted a thick pool of glass, and that he did
not want it to crack. Yes, if the glass will be thin, you don't mind
the cracking, or both, by all means save the electricity or gas and
forgo the annealing.
...James
James Freeman
"All I say is by way of discourse, and nothing by way of advice.=3DA0 I
should not speak so boldly if it were my due to be believed."
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