David Hendley on wed 26 jul 00
Dear Bruce,
Does your friend with the kiln fire copper red glazes?
Copper reds are tricky and the kiln and its firing is more
important than the actual glaze recipe.
Be prepared for heartbreak.
There is a lot written on the subject, even an entire book,
'Copper Reds' by Robert Tichane.
This is a reliable glaze for me:
Simply Red, cone 10R
Custer feldspar 45.0
Gerstley Borate 9.0
Whiting 12.0
Talc 6.0
EPK kaolin 3.0
bentonite 2.5
flint 22.5
copper carbonate .5 to .8
tin oxide 1.8
total 102.3 -- 102.6
You can see test tiles of the glaze, and how it
was developed in Ceramics Monthly, Oct. 1999.
Unlike many copper red glazes, this glaze is well-
balanced within the limit formulas and will not
craze on many claybodies.
--
David Hendley
Maydelle, Texas
hendley@tyler.net
http://www.farmpots.com/
----- Original Message -----
From: Bruce Porth
To:
Sent: Tuesday, July 25, 2000 1:17 AM
Subject: (no subject)
| Generous souls, I am a new to the craft of pottery having been introduced
| through a friend kind enough to also allow some occasional space in his
kiln.
| I am looking for glaze recipes for copperred (gerstley and non-gerstley)
and
| tenmoku (reduction) that I can use as a starting point for
experimentation.
| Cone 10 to 11, porcelain clay body.
|
| Thanks,
| Bruce
|
Bruce Porth on thu 27 jul 00
David,
Thanks for the recipe. Yes, my friend fires almost exclusively copperred and
gets repeatable deep oxblood reds by pushing it almost to C11 in the final
oxidation phase and by monitoring the atmosphere very closely throughout the
firing cycle. So, I don't have to go through ALL the heartbreak, atleast not
all at once (eventually I'll build my own kiln). Being new to the craft and
starting out in porcelain and copperred, heartbreak is inevitable.
I just learned today that Laguna has an engineered substitute for Gerstley.
Has anyone tried it yet? Sheffield Pottery, whom I talked to, said they had
not gotten feedback yet from customers.
Bruce
hal mc whinnie on thu 27 jul 00
when i was doing hiogh fire reduction in a gas kiln i was able to achieve
copper reds by a method of adding wood at the spy holes during the last two
cones of the firing cycle.
hal
-----Original Message-----
From: David Hendley
To: CLAYART@LSV.CERAMICS.ORG
Date: Wednesday, July 26, 2000 10:40 PM
Subject: copper red in a friend's kiln
>Dear Bruce,
>Does your friend with the kiln fire copper red glazes?
>Copper reds are tricky and the kiln and its firing is more
>important than the actual glaze recipe.
>Be prepared for heartbreak.
>There is a lot written on the subject, even an entire book,
>'Copper Reds' by Robert Tichane.
>
>This is a reliable glaze for me:
>Simply Red, cone 10R
>
>Custer feldspar 45.0
>Gerstley Borate 9.0
>Whiting 12.0
>Talc 6.0
>EPK kaolin 3.0
>bentonite 2.5
>flint 22.5
>copper carbonate .5 to .8
>tin oxide 1.8
>total 102.3 -- 102.6
>
>You can see test tiles of the glaze, and how it
>was developed in Ceramics Monthly, Oct. 1999.
>Unlike many copper red glazes, this glaze is well-
>balanced within the limit formulas and will not
>craze on many claybodies.
>
>--
>David Hendley
>Maydelle, Texas
>hendley@tyler.net
>http://www.farmpots.com/
>
>
>
>
>----- Original Message -----
>From: Bruce Porth
>To:
>Sent: Tuesday, July 25, 2000 1:17 AM
>Subject: (no subject)
>
>
>| Generous souls, I am a new to the craft of pottery having been introduced
>| through a friend kind enough to also allow some occasional space in his
>kiln.
>| I am looking for glaze recipes for copperred (gerstley and non-gerstley)
>and
>| tenmoku (reduction) that I can use as a starting point for
>experimentation.
>| Cone 10 to 11, porcelain clay body.
>|
>| Thanks,
>| Bruce
>|
>
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___
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