John Anthony on tue 7 feb 06
This is a version of Craig Martell's
Blue Celadon. Craig posted it to clayart in 2000.
custer feldspar..... 59.37 59.37%
whiting............. 10.53 10.53%
barium carbonate.... 4.08 4.08%
silica.............. 26.02 26.02%
========
100.00
Add Black Iron Oxide 1.0 %
As I recall it needed some epsom salts to
help with settling.
John Anthony
Ama Menec on mon 6 mar 06
Is this a reduction glaze?
(Belated request I know, but my computer has been at the menders for a
couple of weeks; I'm a bit behind on my clayart).
Ama, Totnes, Devon, UK.
----- Original Message -----
From: "John Anthony"
To:
Sent: Wednesday, February 08, 2006 1:01 AM
Subject: Craig's Blue Celadon
> This is a version of Craig Martell's
> Blue Celadon. Craig posted it to clayart in 2000.
>
>
>
> custer feldspar..... 59.37 59.37%
> whiting............. 10.53 10.53%
> barium carbonate.... 4.08 4.08%
> silica.............. 26.02 26.02%
> ========
> 100.00
>
> Add Black Iron Oxide 1.0 %
>
>
> As I recall it needed some epsom salts to
> help with settling.
>
>
> John Anthony
>
>
____________________________________________________________________________
__
> 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.
Dannon Rhudy on mon 6 mar 06
> Is this a reduction glaze?
Yes.
---
---
Craig Martell on mon 6 mar 06
Hello Ama:
Seeing that you are in the UK and may not have any of the same materials
that we use here in the US I'll post the molecular formula for the Blue
Celadon. This doesn't correspond exactly to the recipe that John Anthony
posted though. I've improved the color, depth, and fit and that's the
formula I'm posting. If you don't do calculation perhaps you can have
someone work out the recipe for you.
Blue Celadon cone 10 Reduction
BaO 0.10
CaO 0.46
K2O 0.30
Na2O 0.13
Al2O3 0.48
SiO2 5.77
silica/alumina ratio 11.97/1
When you work out the recipe, add 1% black iron oxide and 3% macaloid for
suspension. The recipe that I use has no clay at all so the macaloid is
very important.
This glaze is a very nice sky blue and needs to be used with very white
porcelain to achieve this color. Application should be fairly thick. You
will need some testing to get this to your liking.
regards, Craig Martell Hopewell, Oregon
Ama Menec on tue 7 mar 06
That was very kind of you Craig! And would have been really useful if I
could do reduction here....
I'm actually after a celadon looking glaze for oxidisation, for a student of
mine, cone 10. The thing that's bugging me is I'm sure I did something like
that when I did my A levels at school, 25 years ago....but can I find the
recipe?? I just feel sure I've seen good oxidised 'celadons'....but unable
to find a recipe to help her. So I've told her we'll just have to experiment
with clear porcelain cone 10 glazes, and small amounts of stain....But a
blue celadon is very interesting too. What is macaloid? Is it a bentonite
type material? Never heard of that one. Many thanks,
Ama, Totnes, Devon, UK.
----- Original Message -----
From: "Craig Martell"
To:
Sent: Monday, March 06, 2006 11:49 PM
Subject: Re: Craig's Blue Celadon
> Hello Ama:
>
> Seeing that you are in the UK and may not have any of the same materials
> that we use here in the US I'll post the molecular formula for the Blue
> Celadon. This doesn't correspond exactly to the recipe that John Anthony
> posted though. I've improved the color, depth, and fit and that's the
> formula I'm posting. If you don't do calculation perhaps you can have
> someone work out the recipe for you.
>
> Blue Celadon cone 10 Reduction
>
> BaO 0.10
> CaO 0.46
> K2O 0.30
> Na2O 0.13
> Al2O3 0.48
> SiO2 5.77
> silica/alumina ratio 11.97/1
>
> When you work out the recipe, add 1% black iron oxide and 3% macaloid for
> suspension. The recipe that I use has no clay at all so the macaloid is
> very important.
>
> This glaze is a very nice sky blue and needs to be used with very white
> porcelain to achieve this color. Application should be fairly thick. You
> will need some testing to get this to your liking.
>
> regards, Craig Martell Hopewell, Oregon
>
>
____________________________________________________________________________
__
> 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.
>
May Luk on tue 7 mar 06
Hello Ama;
I use Burke's Faux Celadon from the Clayart archive. I
think it's a cone 6 glaze. I fired to cone 8/9 in
porcelain Ox. It could be good for another starting
point.
I also use CTM for my stains. I work all sorts of ways
with stain decorations. I've done cone 8 'maiolica'
with CTM stains. They work alright for me. I suppose
it depends on the individual. Azzz, like everything
else. :-)
Re: maiolica technique, I find it very helpful
thinking of it as if it's water colour. I make a
chart; of washes thick and thin, dry brush over wash,
washes over line writing, sponging & lifting etc. I do
the same with water colour on hot press, cold press
and rough and let those be my guide because
watercolours are not the same when it's dry, a bit
like stains on glaze. They are both unforgiving, so
you need to know the outcome before you paint. Please
ignore me if this is off course. Just a thought.
Hello Craig;
I was audacious and I wrote you a couple of years ago
asking about celadon in electric kiln. I don't know if
you remember. Back then I was stingy in buying books
and I also didn't realized celadon is for reduction.
(And I'm Chinese!!, shame shame) Too many things to
absorb in the beginning. You were very generous and
gave me long list of suggestions regarding stains and
such. I printed it out and I had it for long time. I
finally tested your list with Burke's Faux Celadon
with local materials. It worked very well. It's one of
my favourie glaze. It's high expansion in some
instances. Some stains make it refractory naturally.
Fortunately, 2 years on, I know just enough to fix it.
Many thanks again
May
London, UK
Craig Martell on mon 13 mar 06
Ama was saying:
>That was very kind of you Craig! And would have been really useful if I
>could do reduction here....
>I'm actually after a celadon looking glaze for oxidisation, for a student of
>mine, cone 10.
Hello Ama:
I was thinking that you might not be asking for a reduction glaze. If you
want to try and make a celadon colored glaze in oxidation you could start
with a reduction base like a potash spar/limestone clear or translucent
glaze and run series of tests for color. Perhaps the student who wants the
glaze could do all this. It would promote a lot of learning and that's
always of great benefit to students, is it not?
regards, Craig Martell Hopewell, Oregon
Craig Martell on mon 13 mar 06
May sez:
>You were very generous and gave me long list of suggestions regarding
>stains and
>such. I printed it out and I had it for long time. I finally tested your
>list with Burke's Faux Celadon
>with local materials. It worked very well.
Hello May:
Thanks for the above. I'm glad to know that whatever I sent was helpful
and you were able to make a glaze that you like. That's the main
thing. It's always nice to hear about people's results and so often I will
make suggestions to folks and never ever hear another peep out of
them. So, thanks for the post.
regards, Craig Martell Hopewell, Oregon
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