Deborah Zinn on wed 5 nov 97
Hello,
I'm submitting this question for my teacher, Gary Skul, at Sangre de
Cristo Arts Centre in Peublo, Colorado.
Gary is trying to get red celadon at cone 10. He is getting uneven
coloring (from green to blood red) on the same piece. He is using a gas
kiln.
Does anyone have any suggestions as to how he can get even red coloring?
Also, are archives of this site available on the web?
Thanks,
Deborah
In Pueblo, its beautiful today, mid-60s but windy. Soon back to
Australia and summer!
Dannon Rhudy on wed 5 nov 97
Without knowing a bit more, and knowing the celedon recipe he
is using, it is difficult to say. But it sounds as though he
is getting spotty reduction. What are the colorants in his
glaze recipe?
Dannon Rhudy
potter@koyote.com
----------------------------Original
message----------------------------
Hello,
I'm submitting this question for my teacher, Gary Skul, at Sangre
de
Cristo Arts Centre in Peublo, Colorado.
Gary is trying to get red celadon at cone 10. He is getting
uneven
coloring (from green to blood red) on the same piece. He is using
a gas
kiln.
Does anyone have any suggestions as to how he can get even red
coloring?
Also, are archives of this site available on the web?
Thanks,
Deborah
In Pueblo, its beautiful today, mid-60s but windy. Soon back to
Australia and summer!
Denis Whitfield on thu 6 nov 97
Deborah,
Red celadon? - I think this is an oxymoron (a figure of speech).
As I understand it, a celadon is a grey/green/pale blue transparent
feldspathic glaze typically containg 0.5% iron oxide with the colour of the
fired glaze being a consequence of its reduction at stoneware temperatures
(typically cone Orton 10 or 11).
Your description sounds to me as though you are confusing celadon glazes
with copper red glazes - the latter being coloured during reduction because
of the presence of copper.
I suspect the variation of colour you have described is because of a
variation in the degree to which the glaze in the kiln is subject to
reduction. Small gas kilns with single burners are notorious for having
variation of atmosphere during reduction firing programs.
Lets see what others think about my definition of celadon.
Denis
At 10:39 5/11/97 EST, you wrote:
>----------------------------Original message----------------------------
>Hello,
>
>I'm submitting this question for my teacher, Gary Skul, at Sangre de
>Cristo Arts Centre in Peublo, Colorado.
>
>Gary is trying to get red celadon at cone 10. He is getting uneven
>coloring (from green to blood red) on the same piece. He is using a gas
>kiln.
>
>Does anyone have any suggestions as to how he can get even red coloring?
>
>Also, are archives of this site available on the web?
>
>Thanks,
>Deborah
>
>In Pueblo, its beautiful today, mid-60s but windy. Soon back to
>Australia and summer!
>
>
****************************************************************************
DR DENIS WHITFIELD
Senior Lecturer
Coodinator BA(VA)
Co Director, Centre for Ceramic Research, Design and Production
Department of Visual and Peforming Arts
University of Western Sydney, Macarthur
PO Box 555
CAMPBELLTOWN NSW 2560
AUSTRALIA
email: d.whitfield@uws.edu.au
phone: 02 97726345 international: xxx 61 2 97726345
fax: 02 97723244 international: xxx 61 2 97723244
****************************************************************************
Rafael Molina-Rodriguez (Rafael Molina-Rodriguez) on thu 6 nov 97
Deborah :
IMO, Red Celadon is an oxymoron. The hue red is associated with
copper colors and celadons are transparent iron greens and blues.
I subscribe to Brother Thomas Bezanson's definition of celadon :
A large family of grey-green and blue-green glazes originating in China
as far back as the Han dynasty (206 B.C. - 220 B.C.), and possibly
earlier. The source of this special color is iron oxide in small quantities,
either in the body or in the glaze itself.
The name probably originates with the French who imported Chinese
porcelains during the seventeenth century. At that time, a character in a
pastoral play by d'Urfe wore a variety of grey-green costumes and his
name was Celadon. This is the most popular explanation of the term.
Rafael
"I have found that all ugly things are made by those who strive to make
something beautiful, and that all beautiful things are made by those who
strive to make something useful." Oscar Wilde.
Rafael
>>> Deborah Zinn 11/05/97 09:39am >>>
----------------------------Original message----------------------------
Hello,
I'm submitting this question for my teacher, Gary Skul, at Sangre de
Cristo Arts Centre in Peublo, Colorado.
Gary is trying to get red celadon at cone 10. He is getting uneven
coloring (from green to blood red) on the same piece. He is using a gas
kiln.
Does anyone have any suggestions as to how he can get even red
coloring?
Also, are archives of this site available on the web?
Thanks,
Deborah
In Pueblo, its beautiful today, mid-60s but windy. Soon back to
Australia and summer!
Ric Swenson on fri 7 nov 97
then.... is oxyprobe an oxymoron?
I , too think that celadon refers to a "shade of green associated with jade
stone colors" and refers to glazes which contain small amounts of Red Iron
Oxide 0.25 % for a pale gray green color...to about 2 or 3 %...for a
deeper jade green. Iron Saturates....like Bright Brown-Black, Ohata Kaki,
Katsup, RT 13 Temmoku, usw....have 8-11 % Iron Oxide and are
brown-red-black depending on formulation /firing/karma/and kiln gods.
So a "red celadon"...might be a celadon glaze on steroids ie ...an iron
saturate glaze...and the red is the rust red of Ohata Kaki or the like?
Doesn't sound like the description of this problem does it?
Certainly the Copper reds are another story and it sounded form the
description that the spotty reduction was causing green/red variations.
Add 2 % tin oxide...reduce well....open up the load (don't pack too
tightly...so you get good circulation of the oxygen starved gases)
Hamer has a good description of both processes and a very interesting
description of the origin of the word "CELADON"
HTH
Ric
>----------------------------Original message----------------------------
>
>Deborah,
>
>Red celadon? - I think this is an oxymoron (a figure of speech).
>
>As I understand it, a celadon is a grey/green/pale blue transparent
>feldspathic glaze typically containg 0.5% iron oxide with the colour of the
>fired glaze being a consequence of its reduction at stoneware temperatures
>(typically cone Orton 10 or 11).
>
>Your description sounds to me as though you are confusing celadon glazes
>with copper red glazes - the latter being coloured during reduction because
>of the presence of copper.
>
>I suspect the variation of colour you have described is because of a
>variation in the degree to which the glaze in the kiln is subject to
>reduction. Small gas kilns with single burners are notorious for having
>variation of atmosphere during reduction firing programs.
>
>Lets see what others think about my definition of celadon.
>
>Denis
>
>
>
>At 10:39 5/11/97 EST, you wrote:
>>----------------------------Original message----------------------------
>>Hello,
>>
>>I'm submitting this question for my teacher, Gary Skul, at Sangre de
>>Cristo Arts Centre in Peublo, Colorado.
>>
>>Gary is trying to get red celadon at cone 10. He is getting uneven
>>coloring (from green to blood red) on the same piece. He is using a gas
>>kiln.
>>
>>Does anyone have any suggestions as to how he can get even red coloring?
>>
>>Also, are archives of this site available on the web?
>>
>>Thanks,
>>Deborah
>>
>>In Pueblo, its beautiful today, mid-60s but windy. Soon back to
>>Australia and summer!
>>
>>
>****************************************************************************
>DR DENIS WHITFIELD
>Senior Lecturer
>Coodinator BA(VA)
>Co Director, Centre for Ceramic Research, Design and Production
>Department of Visual and Peforming Arts
>University of Western Sydney, Macarthur
>PO Box 555
>CAMPBELLTOWN NSW 2560
>AUSTRALIA
>email: d.whitfield@uws.edu.au
>phone: 02 97726345 international: xxx 61 2 97726345
>fax: 02 97723244 international: xxx 61 2 97723244
>****************************************************************************
#####################################
From: Ric Swenson, ( home ) : P.O. Box 494,
North Bennington, VT 05257 - 0494 U.S.A
home telephone ( 802 ) 447 - 4744
( work ) : Bennington College, Route 67 - A
Bennington, Vermont 05201 - 6001
( 802 ) 440 - 4621 ( fax 440 - 4582 )
email: rswenson@bennington.edu
#####################################
" If you want to teach a bear to dance,
..... you should be prepared to dance.....
..... until the bear gets tired. "
Debby Grant on fri 7 nov 97
Denis,
I agree with your definition of celadon which is achieved with the
presence of iron oxide in the glaze. If the colorant is copper it
has to be a copper red that has been unevenly reduced.
Debby Grant in NH
Paul Jadick on sat 8 nov 97
It seems as if I am the only responding potter who actually may know what
you are referring to when you say red celadon. I know the glaze as
persimmon celadon, I have used it and it is red. Although celadon truly
is a blue,green or gray glaze with it's color coming from iron, this glaze
behaves like a celadon. What I mean is the way it holds the edges of
carving and is fairly transparent. It is the surface type that gives it
its name. I have also used navy celadon. Just an altered blue. As soon
as I can dig up the persimmon celadon I will send out the formula.
Georgia Tenore
still using my husbands e-mail
pjadick@worldnet.att.net
Paul Jadick on tue 11 nov 97
Here is the formula for Persimmon Cleadon. As I said before, I agree that
true Celadon is a blue/green/gray glaze. (purists have opinions about "true
porcelain" too). This is, however, a red that is celadon type glaze. You
can take a base and make it in many different colors, can't you? I haven't
used it in years, but it is worth a test. You should see a translucent
warn red bearing no resemblance to copper red.
Persimmon Celadon
Pot Spar 70%
Flint 14
Whiting 14
Red iron 2
Rutile 3
Bentonite 3
I usually use dark rutile, but try what you have. Gook luck and let us know
what you come up with.
Georgia Tenore @
pjadick@worldnet.att.net
Bill Medalen on tue 11 nov 97
----------
From: Debby Grant=5BSMTP:DEBBYGrant=40aol.com=5D
Sent: Friday, November 07, 1997 5:53 AM
To: Multiple recipients of list CLAYART
Subject: Re: Red Celadon
Just a note from a novice. Perhaps the notion of a red celadon came from =
firing
in a =22copper kiln=22. At the rec center I go to we occationally have =
=22red
firings=22 where every one puts in copper based glazes and reduce heavily. =
The
few porcelain/celadon pieces put near the flue catch a gorgious pink blush =
while
retaining there blueish traditional look. We're doing another copper firing
early December so we can unload at the christmas party. I'm excited=21=21 =
--
Nancy Jewell Music=40sni.net
--------------------------Original message----------------------------
Denis,
I agree with your definition of celadon which is achieved with the
presence of iron oxide in the glaze. If the colorant is copper it
has to be a copper red that has been unevenly reduced.
Debby Grant in NH
Morgan Britt on mon 29 oct 01
Hi Gang,
This is a belated response to a celadon red thread going around awhile
back. Tom Coleman showed us a low fire glaze that he sprayed lightly
over shino to give red flashes for a wood fired look. I tried it over
celadon and you can see what happened. Check it out on my website:
http://www.fireartclayworks.com/Clayart.htm
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