Wanda Holmes on mon 11 nov 02
Ron, John,
As I work to sort out issues of local availability, glaze fit, desired
vitrification, and other properties, I am finding that the optimum
firing temperature for claybodies that work well for me are cone 5 for
one and cone 8 for another. I intend to test your glazes at both
temperatures, but would love to get your perspective on how well they
are likely to perform at cone 5 and at cone 8, respectively.
Thanks,
Wanda
John Hesselberth on mon 11 nov 02
On Monday, November 11, 2002, at 11:56 AM, Wanda Holmes wrote:
> Ron, John,
>
> As I work to sort out issues of local availability, glaze fit, desired
> vitrification, and other properties, I am finding that the optimum
> firing temperature for claybodies that work well for me are cone 5 for
> one and cone 8 for another. I intend to test your glazes at both
> temperatures, but would love to get your perspective on how well they
> are likely to perform at cone 5 and at cone 8, respectively.
>
Hi Wanda,
Your question is not a simple one to answer. A few will be just fine at
cone 5 (e.g. probably Waterfall Brown), some will look fine but will
leach more colorants and will not be as durable (I would expect the high
calcium semimattes would be in this category), and others will probably
be significantly different in appearance.
At cone 8 a few will give you some nice experience in grinding
shelves--I doubt very much Waterfall will be on the pot. Again some will
be OK, some different.
In other words you'll have to test and adjust them accordingly if you
aren't happy with the result. We really haven't tested them extensively
at other temperatures.
Regards,
John
http://www.frogpondpottery.com
http://www.masteringglazes.com
Wanda Holmes on wed 13 nov 02
Thanks, Ron.
I am near Austin, TX. Our local supplier, Armadillo Clay, has several
cone 5 claybodies that I have found in testing to be overfired at cone 6
(they begin to lose strength and are sometimes bloated). They also have
lowfire bodies and cone 10 bodies. One of their cone 10 bodies that I
have tested is pretty well vitrified at cone 8.
Clayworld in San Antonio has another set of bodies to choose from. Many
of the bodies they offer as cone 5-6 bodies are not well vitrified at
cone 6, though I must admit I haven't tested all their bodies as of yet.
I have a cone 8 firing of several of your glazes underway now. I'll
report on the result.
Wanda
-----Original Message-----
From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.CERAMICS.ORG] On
Behalf Of Ron Roy
Sent: Wednesday, November 13, 2002 6:58 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: Ron & John's Glazes - Up or Down a few cones
Hi Wanda,
I agree with what John said about firing our glazes at any other cone -
you
will have to test them to see if they are still stable.
What I can do is help adjust them to fire lower or higher - you will
have
to fire them at what ever temperatures you want to fire at first and
then I
can adjust depending on the results.
The other approach would be to fire some of the clays you like the look
of
- find out if the vitrification is right - you may find some will be
suitable at cone 6. This would be the best solution counting all the
glazes
available for cone 6.
Tell us where you are - you may find other suppliers near enough that
supply proper clay for cone 6.
RR
>Ron, John,
>As I work to sort out issues of local availability, glaze fit, desired
>vitrification, and other properties, I am finding that the optimum
>firing temperature for claybodies that work well for me are cone 5 for
>one and cone 8 for another. I intend to test your glazes at both
>temperatures, but would love to get your perspective on how well they
>are likely to perform at cone 5 and at cone 8, respectively.
>
>
>Thanks,
>Wanda
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
________________________________________________________________________
______
Send postings to clayart@lsv.ceramics.org
You may look at the archives for the list or change your subscription
settings from http://www.ceramics.org/clayart/
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Marie-Claire Stil on wed 13 nov 02
Hi all,
I've tested Ron & John glazes at cone 8 successfully (thanks Ron & John).
The tests were done on porcelain bowls at my usual temperature and they =
are all
beautiful. I must say that where F.3134 or F.3195 is needed I used others
available to me, calculating by hand and getting as close as possible to =
the
analyses given in the book.
As for the famous Waterfall, whose look is the same than my fired Ketchup=
Red
but without the water drops, the best result is a wonderful mountainous
landscape in dark brown/ ocre due to brushing - dipping gave a uniform =
dark
brown not bad either.
I'd need to test and play some more with other colorants though.
Good luck with your testing,
Regards,
Marie Claire
On Mon, 11 Nov 2002 21:13:28 -0500, you wrote:
>On Monday, November 11, 2002, at 11:56 AM, Wanda Holmes wrote:
>
>> Ron, John,
>>
>> As I work to sort out issues of local availability, glaze fit, desired
>> vitrification, and other properties, I am finding that the optimum
>> firing temperature for claybodies that work well for me are cone 5 for
>> one and cone 8 for another. I intend to test your glazes at both
>> temperatures, but would love to get your perspective on how well they
>> are likely to perform at cone 5 and at cone 8, respectively.
>>
>Hi Wanda,
>
>Your question is not a simple one to answer. A few will be just fine at
>cone 5 (e.g. probably Waterfall Brown), some will look fine but will
>leach more colorants and will not be as durable (I would expect the high
>calcium semimattes would be in this category), and others will probably
>be significantly different in appearance.
>
>At cone 8 a few will give you some nice experience in grinding
>shelves--I doubt very much Waterfall will be on the pot. Again some will
>be OK, some different.
>
>In other words you'll have to test and adjust them accordingly if you
>aren't happy with the result. We really haven't tested them extensively
>at other temperatures.
>
>Regards,
>
>John
>
>http://www.frogpondpottery.com
>http://www.masteringglazes.com
>
>________________________________________________________________________=
______
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at =
melpots@pclink.com.
Ron Roy on wed 13 nov 02
Hi Wanda,
I agree with what John said about firing our glazes at any other cone - you
will have to test them to see if they are still stable.
What I can do is help adjust them to fire lower or higher - you will have
to fire them at what ever temperatures you want to fire at first and then I
can adjust depending on the results.
The other approach would be to fire some of the clays you like the look of
- find out if the vitrification is right - you may find some will be
suitable at cone 6. This would be the best solution counting all the glazes
available for cone 6.
Tell us where you are - you may find other suppliers near enough that
supply proper clay for cone 6.
RR
>Ron, John,
>As I work to sort out issues of local availability, glaze fit, desired
>vitrification, and other properties, I am finding that the optimum
>firing temperature for claybodies that work well for me are cone 5 for
>one and cone 8 for another. I intend to test your glazes at both
>temperatures, but would love to get your perspective on how well they
>are likely to perform at cone 5 and at cone 8, respectively.
>
>
>Thanks,
>Wanda
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Ron Roy on sun 17 nov 02
Hi Wanda,
Sounds like they are not testing their clays - not unusual.
One of you choices would be to find two bodies - say a cone 5 body and a
cone 8 body and mix them together to get a cone 6 body. There is some
safely in that way of doing it - chances are they will be more balanced in
combination.
Makes me mad to see clay companies not doing it right - if you need some
help sorting this all out I need to have some idea about shrinkage and
absorbency of the clays you like the look of. I'll be happy to help.
RR
>Thanks, Ron.
>
>I am near Austin, TX. Our local supplier, Armadillo Clay, has several
>cone 5 claybodies that I have found in testing to be overfired at cone 6
>(they begin to lose strength and are sometimes bloated). They also have
>lowfire bodies and cone 10 bodies. One of their cone 10 bodies that I
>have tested is pretty well vitrified at cone 8.
>
>Clayworld in San Antonio has another set of bodies to choose from. Many
>of the bodies they offer as cone 5-6 bodies are not well vitrified at
>cone 6, though I must admit I haven't tested all their bodies as of yet.
>
>I have a cone 8 firing of several of your glazes underway now. I'll
>report on the result.
>
>Wanda
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
Virginia Scotchie on sun 17 nov 02
I am getting ready to mix a 04 oxidation Amber Yellow glaze that calls
for frit 623. Anyone know a substitute frit for this one that may be
more common?
The glaze is:
Frit 623 72
Kaolin 28
Red Iron 20
Bentonite 30
Thanks for any suggestions!
Virginia Scotchie
Assoc. Prof. of Ceramics
Dept. of Art
Univ. of South Carolina
Columbia, SC 29208
Ph. 803-777-7077
email: scotchie@gwm.sc.edu
Tom Buck on sun 17 nov 02
Perhaps Pemco 626? - a sodium/barium alumino-boro-silicate
you could try 3124 - P311 - Fusion F-19. It has enough B2O3 and Al2O to
make glaze with the other components.
Tom Buck ) -- primary address.
"alias" or secondary address.
tel: 905-389-2339 (westend Lake Ontario, province of Ontario, Canada).
mailing address: 373 East 43rd Street, Hamilton ON L8T 3E1 Canada
On Sun, 17 Nov 2002, Virginia Scotchie wrote:
> I am getting ready to mix a 04 oxidation Amber Yellow glaze that calls
> for frit 623. Anyone know a substitute frit for this one that may be
> more common?
> The glaze is:
>
> Frit 623 72
> Kaolin 28
> Red Iron 20
> Bentonite 30
>
> Thanks for any suggestions!
>
> Virginia Scotchie
> Assoc. Prof. of Ceramics
> Dept. of Art
> Univ. of South Carolina
> Columbia, SC 29208
> Ph. 803-777-7077
> email: scotchie@gwm.sc.edu
>
> ______________________________________________________________________________
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at melpots@pclink.com.
>
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