Talbott on wed 15 apr 98
To fire good copper reds you need a gas or wood fired kiln (I
personally have no experience with wood).. Copper reds are at best are DAMN
tricky and anyone who tells you they can fire GOOD copper reds consistently
is probably not telling the truth! Zinc oxide probably has minimal affect
but I use tin oxide in preference to zinc.. tin besides being an opacifier
probably has some chemical affect on the copper... If you want to read a
good book on this topic then read Tichane's book: "Reds, Reds, Copper Reds"
ISBN 0-914267-04-3... I like some aspects of the book but other aspects I
don't care for.. Tichane seems to be writing portion of the book while in a
dream state... but this is still the most authoritive book I have found on
copper reds. (This msg is also posted at "Glaze Composition - High Fire"
board at PotteryInfo.com) Comments and replies are welcomed...
....Marshall
http://www.PotteryInfo.com
101 CLAYART MUGS (Summer 1998)
2ND ANNUAL CLAYARTERS' GALLERY - NAPLES, MAINE (Summer 1998)
E-MAIL ME FOR APPLICATIONS
Celia & Marshall Talbott, Pottery By Celia, Route 114, P O Box 4116,
Naples, Maine 04055-4116,(207)693-6100 voice and fax,(call first)
---------------------------------------------------------------------
Rick Sherman on sat 18 apr 98
----------------------------Original message-----------------------
To fire good copper reds you need a gas or wood fired kiln (I
personally have no experience with wood).. Copper reds are at best are
DAMN tricky and anyone who tells you they can fire GOOD copper reds
consistently is probably not telling the truth! Zinc oxide probably
has minimal affect but I use tin oxide in preference to zinc.. tin
besides being an opacifier probably has some chemical affect on the
copper... If you want to read a good book on this topic then read
Tichane's book: "Reds, Reds, Copper Reds" ISBN 0-914267-04-3... I like
some aspects of the book but other aspects I don't care for.. Tichane
seems to be writing portion of the book while in a dream state... but
this is still the most authoritive book I have found on copper reds.
(This msg is also posted at "Glaze Composition - High Fire"
board at PotteryInfo.com) Comments and replies are welcomed...
....Marshall
----------------------------reply------------------------------------
Copper reds can be obtained with localized reduction, using Silicon
Carbide in an electric kiln. See Herbert Sanders' text Glazes for
Special Effects. There are other texts that also discuss this approach.
I was successful in using this method in the early '50s when we were
unable to reduce with gas. A fellow student got his MFA on localized
reduction of copper reds.
There are those who consistently fire excellent copper reds. At NCECA,
I asked my friend Tom Colemen if he ever gets bored opening a kiln to a
sea of just copper red pots. He is not the only one who can
consistently get great reds and celedons.
About 2/3rd of the formulas I have come across for copper red contain
some zince. It helps in the melt, the brilliance and, we believe, in
the suspension of the copper in the glaze. The tin provides brilliance
and opacity.
Tichane's book is more a philisopical and aesthetic treatise than a
cookbook on how to make and fire copper reds.
Rick Sherman
San Jose, CA USofA
sherman@ricochet.net
Talbott on sun 19 apr 98
Rick and other Clayarters... Great to hear from you...
Three questions:
1) Does Tom Coleman have a web-site address which displays his copper red
glazes?
2) What percentage of ZnO do you add to the copper red recipes?
3) What book(s) do you recommend for copper red glaze recipes..
TIA... Marshall
>----------------------------reply------------------------------------
> Copper reds can be obtained with localized reduction, using Silicon
>Carbide in an electric kiln. See Herbert Sanders' text Glazes for
>Special Effects. There are other texts that also discuss this approach.
>I was successful in using this method in the early '50s when we were
>unable to reduce with gas. A fellow student got his MFA on localized
>reduction of copper reds.
>There are those who consistently fire excellent copper reds. At NCECA,
>I asked my friend Tom Colemen if he ever gets bored opening a kiln to a
>sea of just copper red pots. He is not the only one who can
>consistently get great reds and celedons.
>About 2/3rd of the formulas I have come across for copper red contain
>some zince. It helps in the melt, the brilliance and, we believe, in
>the suspension of the copper in the glaze. The tin provides brilliance
>and opacity.
>Tichane's book is more a philisopical and aesthetic treatise than a
>cookbook on how to make and fire copper reds.
>
>Rick Sherman
>San Jose, CA USofA
>sherman@ricochet.net
http://www.PotteryInfo.com
101 CLAYART MUGS (Summer 1998)
2ND ANNUAL CLAYARTERS' GALLERY - NAPLES, MAINE (Summer 1998)
E-MAIL ME FOR APPLICATIONS
Celia & Marshall Talbott, Pottery By Celia, Route 114, P O Box 4116,
Naples, Maine 04055-4116,(207)693-6100 voice and fax,(call first)
---------------------------------------------------------------------
lpskeen on mon 20 apr 98
Talbott wrote:
> 1) Does Tom Coleman have a web-site address which displays his copper red glaz
Marshall, helLO! Do you take CM? If so, look through it and you will
usually find a full page ad for some sort of kiln (Duh, advertising
didn't work on me.), with a woman seated in the kiln door and Tom
Coleman standing beside the door, and shelf upon shelf of copper red
pots.
--
Lisa Skeen
Living Tree Pottery & Soaps
"We will have to repent in this generation not merely for the hateful
words and actions of the bad people, but for the appalling silence of
the good people." -- Dr. M. L. King, Jr. 4/16/63
DIANA PANCIOLI, ASSOC. PROF. on tue 21 apr 98
I was able to fire copper reds consistently by reducing from body
reduction all the way to the end--steady but not too strong consistent
reduction. The reds varied (they were tiles) from place to place in the
kiln, but they were all red.
Diana
EMU
On Sun, 19 Apr 1998, Talbott wrote:
> ----------------------------Original message----------------------------
> Rick and other Clayarters... Great to hear from you...
>
> Three questions:
> 1) Does Tom Coleman have a web-site address which displays his copper red
> glazes?
> 2) What percentage of ZnO do you add to the copper red recipes?
> 3) What book(s) do you recommend for copper red glaze recipes..
>
> TIA... Marshall
> >----------------------------reply------------------------------------
> > Copper reds can be obtained with localized reduction, using Silicon
> >Carbide in an electric kiln. See Herbert Sanders' text Glazes for
> >Special Effects. There are other texts that also discuss this approach.
> >I was successful in using this method in the early '50s when we were
> >unable to reduce with gas. A fellow student got his MFA on localized
> >reduction of copper reds.
> >There are those who consistently fire excellent copper reds. At NCECA,
> >I asked my friend Tom Colemen if he ever gets bored opening a kiln to a
> >sea of just copper red pots. He is not the only one who can
> >consistently get great reds and celedons.
> >About 2/3rd of the formulas I have come across for copper red contain
> >some zince. It helps in the melt, the brilliance and, we believe, in
> >the suspension of the copper in the glaze. The tin provides brilliance
> >and opacity.
> >Tichane's book is more a philisopical and aesthetic treatise than a
> >cookbook on how to make and fire copper reds.
> >
> >Rick Sherman
> >San Jose, CA USofA
> >sherman@ricochet.net
>
> http://www.PotteryInfo.com
>
> 101 CLAYART MUGS (Summer 1998)
> 2ND ANNUAL CLAYARTERS' GALLERY - NAPLES, MAINE (Summer 1998)
> E-MAIL ME FOR APPLICATIONS
>
> Celia & Marshall Talbott, Pottery By Celia, Route 114, P O Box 4116,
> Naples, Maine 04055-4116,(207)693-6100 voice and fax,(call first)
> ---------------------------------------------------------------------
>
Rick Sherman on fri 24 apr 98
------------------------original message-------------------------------
Rick and other Clayarters... Great to hear from you...
Three questions:
1) Does Tom Coleman have a web-site address which displays his copper
red
glazes?
2) What percentage of ZnO do you add to the copper red recipes?
3) What book(s) do you recommend for copper red glaze recipes..
TIA... Marshall
-----------------------reply------------------------------------------
Marshall:
I sent a response to your questions a few days ago. I don't know if it
reached you or is out in the ether somewhere. Just in case, I will try
to remember what a wrote and send it again.
1) Tom does not have a web-site but, as you have discovered, Geil
kilns pictures his copper reds. I have seen and picked up the pots at
NCECA and they are consisent and genuine. He and Elaine are also
skilled in getting great celedon. I talked with Tom the other day and
he would be happy to talk with you about firing reds. His studio number
(702)451-1981. He says you don't need a Geil in order to get good reds
consistently. You might also be interested in his porcalain. I have
tried it and it throws and fires beautifully.
2) You don't need to have ZnO in a formula for copper reds. Herbert
Sanders used it to aid in glaze melt at ^9 and he felt it imparted
brilliance. Too much makes a glaze opaque and dull. Try between 2.5%
and 3.5% for reduction firing and 1% to 2+% for localized reduction
with SiO2. Sanders had a proclivity to use lots of materials in his
glaze compositions, up to 16 different materials. This is not
necessary.
3) Concerning books: If you want simple formulas, a cook-book
approach, try: Ceramic Formulas, the Compete Compendium
by John Conrad, McMillan Publishing
The Potters Complete Book of Clay and Glazes
by James Chappell, Watson Guptill
And old Cermaics Monthlys
If you would like to experiment using triaxial/quadaxial blending
techniques for clay and color development, Use Robin Hopper's The
Cermaic Spectrum, Chilton.
For a broader understanding of the making and firing or copper reds,
use: Glazes for Special Effect, Herbert Sanders, Watson Guptill. It
also contains lots of formulas.
Chineses Stoneware Glazes, Joseph Grebnier, Watson Guptill. You
will find some interesting formulas and a clear approach to the basics.
Clay and Glazes for the Potter, Danial Rhodes, Chilton. Covers
the subject briefly. Most of the experiments were done by his students
at Alfred.
That should keep you busy for awhile. Good luck.
Rick Sherman
San Jose, CA USofA
sherman@ricochet.net
Talbott on fri 24 apr 98
Rick...
Thanks and I appreciate your response. My "best" copper red comes
from Tichane's book (the ox-blood red)... I too have heard that ZnO in
large amounts can be detrimental to copper reds even if applied to other
pieces that are not being fired to get reds. It must somehow volatize
throughout the kiln and somehow hinder the formation of copper reds. I
know reds are tricky for 99.99% of the potters that fire them. I almost
always use copper glaze in conjunction with other glazes on the same
piece.. Again thanks for the information...
Take Care... Marshall
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