Mary Adams on thu 12 oct 06
I'm trying to save some dollars on electricity. Is it possible to put some
Cone 05/06 glazed items into a bisque firing at that cone or will this cause
problems (fumes, etc?)??
Thanks for any help.
Mary
L. P. Skeen on thu 12 oct 06
I've done it with no ill effects that I'm aware of.... HOWEVER - I'd =
put the glazed ware on shelves above the greenware , JUST IN CASE there =
was a 'mishap', such as popout or explosion of greenware....that =
way you won't have pieces of bare clay shard stuck in your glazed =
pieces. :)
L. P. Skeen, Summerfield NC
Get your 2007 Clay Lover's Calendar at =
http://www.living-tree.net/calendar.htm
----- Original Message -----=20
From: Mary Adams=20
I'm trying to save some dollars on electricity. Is it possible to put =
some Cone 05/06 glazed items into a bisque firing at that cone or will =
this cause
problems (fumes, etc?)??
Ann Brink on thu 12 oct 06
Hi Mary, I've done this for years. I make sure and have a temp. hold at the
end of the firing cycle for glazes to fully melt and smooth out.
Ann Brink in Lompoc CA
.
----- Original Message -----
From: "Mary Adams"
Subject: Glaze firing while bisque firing
> I'm trying to save some dollars on electricity. Is it possible to put
> some
> Cone 05/06 glazed items into a bisque firing at that cone or will this
> cause
> problems (fumes, etc?)??
>
> Thanks for any help.
>
> Mary
>
Dannon Rhudy on fri 13 oct 06
Lisa said:
..........Since we know copper reds can be had at mid-fire temps, why not at
earthenware temps?.........
Lisa, I don't know re: paper clay producing enough
carbon for reds to occur. However, I can tell you
that you can certainly have copper reds fired to about
010 (1625F or so). I did it repeatedly as an undergrad.
I found that one needed only in-kiln reduction at some
point in the firing; slow cooling or slow firing enhanced
the reds. I used about a half percent up to two percent
copper in my glaze, and did no post-firing reduction.
These glazes were raku glazes, and I fired them in
the raku kilns. Once I fired them in a regular gas kiln
(when no one was looking; instructor wouldn't have
wanted the waste of time/gas to do it). That necessarily
slow firing turned out solid copper red pieces, very
glossy. Still works.
regards
Dannon Rhudy
Ron Roy on fri 13 oct 06
Hi Mary,
I assume you are asking about electric firing. There are lots of organics
released during a bisque firing so good ventilation and a slower rather
than faster firing is necessary - so any reduction is avoided.
I have done this many years ago and did notice some changes to the glazes
due to some reduction - that was before the days of proper kiln vents and
our better understanding of what goes on in an electric kiln.
I'm saying you will probably see some differences but perhaps not enough to
mater.
RR
>I'm trying to save some dollars on electricity. Is it possible to put some
>Cone 05/06 glazed items into a bisque firing at that cone or will this cause
>problems (fumes, etc?)??
>
>Thanks for any help.
>
>Mary
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
L. P. Skeen on fri 13 oct 06
Whoa Ron, you just opened up a whole can of possibilities! In theory, =
anyway. If one used paperclay in the kiln, which paper would have to be =
burned out, might that create enough reduction to change the color of a =
(for example) copper red at that low a temperature? Since we know =
copper reds can be had at mid-fire temps, why not at earthenware temps? =
Would the vent need to be left OFF so as not to introduce oxygen in the =
firing chamber?
L. P. Skeen, Summerfield NC
Get your 2007 Clay Lover's Calendar at =
http://www.living-tree.net/calendar.htm
----- Original Message -----=20
From: Ron Roy=20
There are lots of organics released during a bisque firing so good =
ventilation and a slower rather
than faster firing is necessary - so any reduction is avoided.
I have done this many years ago and did notice some changes to the =
glazes due to some reduction -
Ron Roy on sun 15 oct 06
Hi Lisa,
Yes - leave the vent off of course - and seal up any ways that fresh air
can get in - as much as possible.
Maybe add some bits of wood to make sure you have enough reduction.
It will shorten the life of your elements.
RR
>Whoa Ron, you just opened up a whole can of possibilities! In theory,
>anyway. If one used paperclay in the kiln, which paper would have to be
>burned out, might that create enough reduction to change the color of a
>(for example) copper red at that low a temperature? Since we know copper
>reds can be had at mid-fire temps, why not at earthenware temps? Would
>the vent need to be left OFF so as not to introduce oxygen in the firing
>chamber?
>
>L. P. Skeen, Summerfield NC
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
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