Wade Blocker on mon 6 aug 01
Joyce,
Some years ago in Ceramic Monthly there was an article about using
charcoal for local reduction in electric kiln firing.
You might find the article by searching for it in your local library in
the periodical guide to literature,starting about 10 years ago. If you have
Ceramic Monthly going back for a number of years just check the annual
index -every December issue- under glazes. Mia in ABQ
Joyce Lee on mon 6 aug 01
Phil said:
"I hate to remind you but charcoal ash is wood ash!=20
Were you talking about charcoal dust as an addition to glazes that =
introduces a local reduction."
------------------------------------------
I think that may be what I was talking about, Phil.
At one point we had a thread which mentioned charcoal or charcoal ash, =
but I had no luck finding it in the archives. Must be that the charcoal =
itself was added to the kiln through peepholes?? And maybe the charcoal =
ash was used separately as an addition to glazes??? I recall that I was =
fascinated, bought a bag of charcoal, and promptly forgot about it all. =
Now I'm intrigued once again.
I do add slivers of wood through the peeps on occasion just before the =
kiln reaches peak temperature and have liked the results........when I =
added enough wood to make a discernible difference and with particular =
glazes. Dannon advised me on that procedure. (thank you, Dannon) But =
I'm always fearful that I'll wind up with broken, or at least disturbed, =
pots if the wood slivers make it intact into the kiln environment.
I know that the prudent move is to simply deal with what I have ...... a =
gas reduction kiln..... and quit trying to make it into something else =
.... a wood fire kiln..... but there you are ... sometimes I'm prudent =
and sometimes I'm not.... about kilns, it's usually "not."
Joyce
In the Mojave where it is too hot to breathe.. and the afternoon winds =
are blowing in the alkali dust from Owens Valley to the north ... off =
that dry lake bed that was left when L. A. ripped off our water....... =
for shame!
philrogers pottery on tue 7 aug 01
Joyce,
Charcoal can be introduced into the kiln chamber to effect a reduction as in
the 'Yohen' firing technique that Shimaoka uses in his first chamber. As I
understand it the charcoal is fed into the chamber as it reaches top
temperature and then it is sealed. Others more knowledgeable than I can
expand on that.
What I thought you were talking about was the addition of Charcoal dust to
stoneware glazes to effect a local reduction in an oxidised firing. I
remember playing with this many years ago after reading about the English
potter Peter Smith and his experiments. If you want to try this ( its a bit
like adding silicon carbide to a glaze) I can dig out a starting recipe for
you.
Charcoal ash is woodash and of course can be used in glazes in just the same
way as woodash from any other source.
Best,
Phil.
Phil and Lynne Rogers,
Lower Cefn Faes,
RHAYADER.
Powys. LD6 5LT.
Tel/fax. (44) 01597 810875.
philrogers@ntlworld.com
www.philrogerspottery.com
----- Original Message -----
From: Joyce Lee
To:
Sent: Monday, August 06, 2001 6:25 PM
Subject: Charcoal/Wood Ash
Phil said:
"I hate to remind you but charcoal ash is wood ash!
Were you talking about charcoal dust as an addition to glazes that
introduces a local reduction."
------------------------------------------
I think that may be what I was talking about, Phil.
At one point we had a thread which mentioned charcoal or charcoal ash, but I
had no luck finding it in the archives. Must be that the charcoal itself
was added to the kiln through peepholes?? And maybe the charcoal ash was
used separately as an addition to glazes??? I recall that I was fascinated,
bought a bag of charcoal, and promptly forgot about it all. Now I'm
intrigued once again.
I do add slivers of wood through the peeps on occasion just before the
kiln reaches peak temperature and have liked the results........when I added
enough wood to make a discernible difference and with particular glazes.
Dannon advised me on that procedure. (thank you, Dannon) But I'm always
fearful that I'll wind up with broken, or at least disturbed, pots if the
wood slivers make it intact into the kiln environment.
I know that the prudent move is to simply deal with what I have ...... a gas
reduction kiln..... and quit trying to make it into something else .... a
wood fire kiln..... but there you are ... sometimes I'm prudent and
sometimes I'm not.... about kilns, it's usually "not."
Joyce
In the Mojave where it is too hot to breathe.. and the afternoon winds are
blowing in the alkali dust from Owens Valley to the north ... off that dry
lake bed that was left when L. A. ripped off our water....... for shame!
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