Reid Harvey on thu 6 apr 00
Dear All,
Can anyone tell me at what maximum and minimum temperatures I can hope
for success in doing raku? For example could I do it with earthenware
glazes? Should the appropriate cone for the glaze be where the piece is
at when reduction starts?
Thanks
Reid Harvey
Deborah B. on fri 7 apr 00
Hi Reid,
Most raku occurs at around 1800 F. or cone 06 07 and below. reduction
occurs at that point becuase you usually take it out of the kiln into the
sawdust or straw to reduce, however a certain ammount of cooling occurs
during transferr from kiln to reduction area.
Deborah
>From: Reid Harvey
>Reply-To: Clayart Discussion Group
>To: CLAYART@LSV.UKY.EDU
>Subject: max. & min. temperatures for raku
>Date: Thu, 6 Apr 2000 10:20:18 EDT
>
>----------------------------Original message----------------------------
>Dear All,
>Can anyone tell me at what maximum and minimum temperatures I can hope
>for success in doing raku? For example could I do it with earthenware
>glazes? Should the appropriate cone for the glaze be where the piece is
>at when reduction starts?
>Thanks
>Reid Harvey
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Dannon Rhudy on fri 7 apr 00
At 10:20 AM 4/6/00 EDT, you wrote:
>----------------------------Original message----------------------------
>Dear All,
>Can anyone tell me at what maximum and minimum temperatures I can hope
>for success in doing raku? For example could I do it with earthenware
>glazes? Should the appropriate cone for the glaze be where the piece is
>at when reduction starts?
>Thanks
>Reid Harvey
Once the piece is bisque fired, then there is a wide range
of possibility for raku firing. You certainly can use earthenware
glazes, things that mature in the 08-04 range, many people
do that specifically for the color. Most lowfire glazes
will crackle when used in raku firing, an attractive finish.
Yes, the glaze should be melted when you take the piece from
the kiln. You can use a cone, or monitor visually, to
decide when the piece is ready to remove from the kiln. If
you use other raku glazes, again you remove the piece when
the glaze has melted. The temperature range varies with
the glaze, obviously, from those very high in borax which
melt quickly, to those glazes formulated to melt at about
cone 05. No doubt you could fire to even higher temps and
still get a raku-like effect, i.e., crackle, smoked surface, etc.
I've known some to fire as high as cone 1, doing American-type
raku. This may seem obvious, but: keep the glazes that
are fired simultaneously in the same approximate temp. range.
I chronically have students trying to fire work with glazes
that melt at 1500F along with work where the glaze does not melt
until 1800F. Sighhhhhhh.....
regards
Dannon Rhudy
potter@koyote.com
>
Marvin Flowerman on fri 7 apr 00
Dear Reid:
Those Raku specialists I know who use temperature guides aim for 960
Centigrade as a finishing temperature. This is a good approximation but you
also need to guide yourself by eye to judge the condition of the glazed
surface to know when the piece is ready to be removed from the kiln.
Hope this helps somewhat.
Good luck!
Marvin Flowerman (marvpots@aol.com)
Marcia Selsor on fri 7 apr 00
Raku usually goes from ^09-^06. Earthenware glazes should/could work but
if the firing is fast they made need a little more time to melt. You can
fire them in an electric kiln and then Raku them This is one way to get
bright colors.
Marcia Selsor
Reid Harvey wrote:
>
> ----------------------------Original message----------------------------
> Dear All,
> Can anyone tell me at what maximum and minimum temperatures I can hope
> for success in doing raku? For example could I do it with earthenware
> glazes? Should the appropriate cone for the glaze be where the piece is
> at when reduction starts?
> Thanks
> Reid Harvey
--
Marcia Selsor
selsor@imt.net
http://www.imt.net/~mjbmls
http://www.imt.net/~mjbmls/spain99.html
http://www.silverhawk.com/ex99/selsor/welcome.html
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