John Rodgers on fri 18 apr 03
Geoffrey, welcome to Clayart!
Regards your query about glazes.... Reds are notorious for burning out
at the higher temperatures, and consequently any bright red, be it
glossy or otherwise, is pretty well limited to the bottom end of the
firing range. There are some good reds that are copper reds but for the
most part, they are produced in a reduction atmosphere in a fuel fired
kiln. I would suggest going to commercial red glazes to get the bright
glossy red you seek. Of course this also requires close attention to
the firing range of the clay body that you use.
AMACO makes some decent red glazes as do others.
Good Luck in your quest.
Regards,
John Rodgers
Birmingham, AL
Geoffrey Gaskell wrote:
>Preliminary introduction:
>I am new to this list and new to ceramic art. I'm typecast or classified as
>an invalid because of my state of mind and the need for constant monitoring
>and medication. I do my ceramics at an artspace for mental health service
>consumers. I have been fortunate to have discovered a certain versatility in
>creating art in almost every medium that I have tried from painting in
>watercolours, acrylics & oils to woodcut printing, stone sculpture and even
>sewing. The artspace has an electric kiln which produces only an oxidising
>atmosphere and the management are not prepared to risk experimenting with
>methods of creating reduction regions therein. I also enjoy reading, getting
>rid of dust & clutter, classical music, small population densities & peace
>and quiet.
>
>The Big Question:
>Does anyone know of any good preferably high gloss red glaze recipes that
>can be produced exclusively in the oxidising atmosphere of an electric kiln?
>Apparently one can simply buy some commercially made glazes, but they are
>too expensive for limited budgets and I don't mind re-inventing wheels
>anyway.
>
>Geoffrey Gaskell
>
>______________________________________________________________________________
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>
>
John Hesselberth on fri 18 apr 03
Hi Geoffrey,
Welcome to Clayart. You'll generally find us a friendly bunch. Yes you
can produce reds in an oxidizing atmosphere. It depends on the shade
of red you want. You can get reds variously called raspberry or
cranberry or something similar via chrome/tin pink technology. Bill
Edwards has recently published recipes on Clayart--you can probably
find them in the archives if you will search on his name--and there is
also a good one in Mastering Cone 6 Glazes.
Truer reds can be obtained using cadmium inclusion stains. I think
that is what you will find in most of the commercial versions. Cadmium
is, of course, very toxic; however the inclusion stains are said to be
quite stable. I don't know--I have never used or tested them.
Regards,
John
On Friday, April 18, 2003, at 05:54 PM, Geoffrey Gaskell wrote:
> Does anyone know of any good preferably high gloss red glaze recipes
> that
> can be produced exclusively in the oxidising atmosphere of an electric
> kiln?
> Apparently one can simply buy some commercially made glazes, but they
> are
> too expensive for limited budgets and I don't mind re-inventing wheels
> anyway.
http://www.frogpondpottery.com
http://www.masteringglazes.com
william schran on sat 19 apr 03
Geoffrey asks: red glaze recipes that
can be produced exclusively in the oxidising atmosphere of an electric kiln?>
You have a few choices to produce reds in "oxidation".
1 - cadmium inclusion stains to produce reds, oranges & yellows
2 - iron reds, not a "blood red", but some nice variations
3 - create artificial reduction with a copper glaze using silicon carbide
4 - use chrome/tin combination
All of the above have been discussed and can be found in the archives.
Bill
Geoffrey Gaskell on sat 19 apr 03
Preliminary introduction:
I am new to this list and new to ceramic art. I'm typecast or classified as
an invalid because of my state of mind and the need for constant monitoring
and medication. I do my ceramics at an artspace for mental health service
consumers. I have been fortunate to have discovered a certain versatility in
creating art in almost every medium that I have tried from painting in
watercolours, acrylics & oils to woodcut printing, stone sculpture and even
sewing. The artspace has an electric kiln which produces only an oxidising
atmosphere and the management are not prepared to risk experimenting with
methods of creating reduction regions therein. I also enjoy reading, getting
rid of dust & clutter, classical music, small population densities & peace
and quiet.
The Big Question:
Does anyone know of any good preferably high gloss red glaze recipes that
can be produced exclusively in the oxidising atmosphere of an electric kiln?
Apparently one can simply buy some commercially made glazes, but they are
too expensive for limited budgets and I don't mind re-inventing wheels
anyway.
Geoffrey Gaskell
Tony Hansen on sat 19 apr 03
I\'ve tried the cadmium inclusion stains. They are more expensive
than other stains and it takes fives time as much to get the color.
For example, Mason Blackberry Wine works well at 5%, where as
the cadmium stains take 25%. This is fabulously expensive and
besides, I did not like the color anyway, it was a boring red flat
red.
A high CaO glaze like this one
http://digitalfire.ab.ca/cermat/education/114.php
using a chrome-tin maroon stain like blackberry wine and
cooled quickly so it does not crystallize is passable, but
not red.
The best cone 6 red I have seen is
http://digitalfire.com/gerstleyborate/recipes/ironreds.shtml
This works better using Boraq than Gerstley Borate. I use
this glaze all the time, it likes to blister sometimes, but the
variegation between thin and thick is great and it can be
a deep vibrant red, but not a blood red.
> The Big Question:
> Does anyone know of any good preferably high gloss red glaze recipes that
> can be produced exclusively in the oxidising atmosphere of an electric kiln?
> Apparently one can simply buy some commercially made glazes, but they are
> too expensive for limited budgets and I don\'t mind re-inventing wheels
> anyway.
> Geoffrey Gaskell
========
Tony Hansen
Geoffrey Gaskell on sun 20 apr 03
Thank you to everyone who responded on and off the list. It is high time
that I take myself off to do some research on these matters.
Geoffrey Gaskell
Tony Hansen on mon 28 apr 03
The recipe is in the first paragraph after the Randys Red title.
It employs the standard GB 50, kaolin 20, silica 30 base recipe and adds 15% iron.
> Tony,
> Is the recipe for this on the site? I couldn\'t see it, just analysis.
> Thanks,
> Ian
> >The best cone 6 red I have seen is
> >http://digitalfire.com/gerstleyborate/recipes/ironreds.shtml
========
Tony Hansen
Ian Macmillan on mon 28 apr 03
Tony,
Is the recipe for this on the site? I couldn't see it, just analysis.
Thanks,
Ian
>
>
>The best cone 6 red I have seen is
>http://digitalfire.com/gerstleyborate/recipes/ironreds.shtml
>
>This works better using Boraq than Gerstley Borate. I use
>this glaze all the time, it likes to blister sometimes, but the
>variegation between thin and thick is great and it can be
>a deep vibrant red, but not a blood red.
>
Mr Don R Tucker on sun 4 apr 04
In America we all call that Pete's red....Pete Pinnnel
got it named after him by figuring it out....I use it
on everything.............cone ten and beautifully
itself or over or under every other pot cover...
PAX
artimator
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Tom Buck on fri 30 sep 05
David S:
welcome to the fuzzy world of iron oxide red Cone 6 oxidation. The
Shatz Ketchup Red glaze bears a strong lookalike to the well established
Randy's Red and the many variations of it.
This type of red requires a precise firing program, and quality
materials, especially Gerstley Borate and Talc.
To keep the red colour of Fe2O3 you need to fire somewhat slowly
and soak mightily. The glaze has to melt fully, and be not too viscous,
and all this before your kiln reaches 2200 oF, so that the final rise to
Cone 6 occurs during the soak, and during which time the iron crystals
come to the surface and stay there.
if you overfire, much of the Fe2O3 will switch to FeO (black
colour) and up to 5% of the FeO will dissolve in the liquid melt and
result in a glaze that has a brown hue of some undistinguished quality.
some potters undertake a refire of this type of glaze by placing
the piece in a Cone 04 bisque firing, and doing a slow downfire after C04
is reached. some times this leads to a red pot.
David, if you try the Clayart archives, you may be able to find
earlier discussions of Randy's Red and similar mixes.
later. peace Tom B.
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
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