Jim Innes on mon 30 apr 01
I am looking for a light blue celadon for cone 10. I have tried out =3D
about 20 so far but have not come up with what I want. Any help would be =
=3D
much appreciated. Jim
Stephen Grimmer on mon 30 apr 01
Jim,
This one is pretty good. That's a potash feldspar in there. Different
spars give different results. I hear Fukushima feldspar from Japan is
outstanding. Try with any feldspar you can get ahold of. If your bentonit=
e
isn't really clean, I would try V-Gum T instead. A little HCl will help
suspend this, too. Celadons are very sensitive to firing differences. Red=
uce
early, reduce often! Try firing to cone 8 very slowly.
I have developed some high Ba celadons that are REALLY blue, but have
not tested them for release. You could easily re-calculate this one with
BaCO3 and get a glaze the color of pre-washed denim.
Steve
Kawaii Celadon
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
G-200 FELDSPAR G200. 69.31 67.96%
WHITING............. 13.86 13.59%
FLINT............... 13.86 13.59%
BENTONITE........... 2.97 2.91%
*Red Iron............ 1.98 1.94%
=3D=3D=3D=3D=3D=3D=3D=3D
101.98
CaO 0.57* 9.48%
MgO 0.01* 0.11%
K2O 0.29* 8.12%
Na2O 0.12* 2.27%
TiO2 0.00 0.00%
Al2O3 0.48 14.47%
SiO2 3.69 65.38%
Fe2O3 0.00 0.17%
Cost/kg 0.07
Si:Al 7.67
SiB:Al 7.67
Expan 8.19
--
Stephen Grimmer
Southern Illinois University at Carbondale
> From: Jim Innes
> Subject: Light Blue Celadon
>
> I am looking for a light blue celadon for cone 10. I have tried out abo=
ut 20
> so far but have not come up with what I want. Any help would be much
> appreciated. Jim
Lee Marshall on mon 30 apr 01
In a message dated 4/30/01 1:05:04 AM Central Daylight Time,
innes@VOYAGER.CO.NZ writes:
<< I am looking for a light blue celadon for cone 10. >>
try tom coleman's non iron blue. works great for me
lee
Lorraine Pierce on mon 30 apr 01
Hi Jim...I notice that Tom Coleman's recipes contain from 1.9% to 2.3%
yellow iron oxide , which he says doesn't create spots. He also has a
non-iron blue celadon that uses 1.9% Mason Stain #6390. I haven't yet use=
d
either. The blue celadons work best over porcelain as you no doubt know.
Let me know how you make out and what body you are using. Lori in New P=
ort
Richey, Fl.
Craig Martell on wed 2 may 01
Hi:
I sent this post the other day and it hit the cyber round file like another
one I sent last week. So this is attempt #2.
........................................................................Ka-snip
Hello Jim:
I've been able to make some light blue celadons and here's what I've found out.
If you are going to make a "true" blue celadon with only iron as the
colorant, the glaze needs to be very high in potassium. If you look at
these glazes in the seger formula, the flux column for an ideal blue
celadon is: .3 potassium, .7 calcium. This is impossible to do with the
spars we have. All potash spars contain some sodium. The best I've been
able to do is .3 potassium, .1 sodium, and .6 calcium. This makes a very
nice blue celadon as in, sky blue. The alumina is at about .4 and the
silica is about 4.5 moles. To make these glazes, you need a potash
feldspar that is at least 10% potassium. I use Kingman feldspar which has
12% potassium and this is really and ideal feldspar for blue
celadons. Kingman is no longer available commercially. I have a good
supply laid away.
Two other things to look at are the silica/alumina ratio which should be
around 12/1 for most blues and also barium carb for a more intense but
still soft sky blue. The barium carb percentage for these glazes is
usually around 4 to 5%.
Here's a suggested recipe for a sky blue. If you don't want to use barium,
just omit it. Also, you will get a much better blue with this recipe if
you use a feldspar that contains 12% potassium in the analysis. Sodium
really screws up iron blues unless the glaze is a chun blue. Then, soda
works very well.
potash feldspar 55
whiting 15
barium 4
silica 26
add: macaloid or vee gum T 3%
black iron oxide 1%
Mix the glazes wet and ball mill for one hour to disperse the iron and
avoid spotting. If you don't have a mill, screen twice with a 200
mesh. You can also use yellow iron instead of black and it will disperse
better. I get better color with black iron
These glazes will always look best on a porcelain body that is very low in
titanium. I use a grolleg body for the blue celadons and it makes a big
difference. My other porcelain is higher in iron and TiO2.
regards, Craig Martell in Oregon
Matt MacIntire on fri 17 may 02
-----Original Message-----
From: Stephen Grimmer [mailto:grimmer@MIDWEST.NET]=20
Sent: Monday, April 30, 2001 7:58 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: Light Blue Celadon
Jim,
This one is pretty good. That's a potash feldspar in there.
Different spars give different results. I hear Fukushima feldspar from
Japan is outstanding. Try with any feldspar you can get ahold of. If
your bentonite isn't really clean, I would try V-Gum T instead. A little
HCl will help suspend this, too. Celadons are very sensitive to firing
differences. Reduce early, reduce often! Try firing to cone 8 very
slowly.
I have developed some high Ba celadons that are REALLY blue, but
have not tested them for release. You could easily re-calculate this one
with BaCO3 and get a glaze the color of pre-washed denim.
Steve
Kawaii Celadon
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
G-200 FELDSPAR G200. 69.31 67.96%
WHITING............. 13.86 13.59%
FLINT............... 13.86 13.59%
BENTONITE........... 2.97 2.91%
*Red Iron............ 1.98 1.94%
=3D=3D=3D=3D=3D=3D=3D=3D
101.98
CaO 0.57* 9.48%
MgO 0.01* 0.11%
K2O 0.29* 8.12%
Na2O 0.12* 2.27%
TiO2 0.00 0.00%
Al2O3 0.48 14.47%
SiO2 3.69 65.38%
Fe2O3 0.00 0.17%
Cost/kg 0.07
Si:Al 7.67
SiB:Al 7.67
Expan 8.19
--
Stephen Grimmer
Southern Illinois University at Carbondale
> From: Jim Innes
> Subject: Light Blue Celadon
>
> I am looking for a light blue celadon for cone 10. I have tried out=20
> about 20 so far but have not come up with what I want. Any help would=20
> be much appreciated. Jim
________________________________________________________________________
______
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You may look at the archives for the list or change your subscription
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Michele Williams on fri 17 may 02
You said "Fire to Cone 8 very slowly." Is that all or are we then to go to
cone 10 as the celadon recipes I've collected show?
Michele Williams
----- Original Message -----
From: "Matt MacIntire"
To:
Sent: Friday, May 17, 2002 11:25 AM
Subject: Re: Light Blue Celadon
-----Original Message-----
From: Stephen Grimmer [mailto:grimmer@MIDWEST.NET]
Sent: Monday, April 30, 2001 7:58 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: Light Blue Celadon
Jim,
This one is pretty good. That's a potash feldspar in there.
Different spars give different results. I hear Fukushima feldspar from
Japan is outstanding. Try with any feldspar you can get ahold of. If
your bentonite isn't really clean, I would try V-Gum T instead. A little
HCl will help suspend this, too. Celadons are very sensitive to firing
differences. Reduce early, reduce often! Try firing to cone 8 very
slowly.
I have developed some high Ba celadons that are REALLY blue, but
have not tested them for release. You could easily re-calculate this one
with BaCO3 and get a glaze the color of pre-washed denim.
Steve
Kawaii Celadon
==============
G-200 FELDSPAR G200. 69.31 67.96%
WHITING............. 13.86 13.59%
FLINT............... 13.86 13.59%
BENTONITE........... 2.97 2.91%
*Red Iron............ 1.98 1.94%
========
101.98
CaO 0.57* 9.48%
MgO 0.01* 0.11%
K2O 0.29* 8.12%
Na2O 0.12* 2.27%
TiO2 0.00 0.00%
Al2O3 0.48 14.47%
SiO2 3.69 65.38%
Fe2O3 0.00 0.17%
Cost/kg 0.07
Si:Al 7.67
SiB:Al 7.67
Expan 8.19
--
Stephen Grimmer
Southern Illinois University at Carbondale
> From: Jim Innes
> Subject: Light Blue Celadon
>
> I am looking for a light blue celadon for cone 10. I have tried out
> about 20 so far but have not come up with what I want. Any help would
> be much appreciated. Jim
________________________________________________________________________
______
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.
____________________________________________________________________________
__
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
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Matt MacIntire on sat 18 may 02
eeesh... =20
That post was not mine. I started to reply to that message with a
follow up question, but I accidentally double-clicked and before I could
do anything the message was off to the list without anything written by
me. Sorry for the confusion.
The original post was not by me, but by Stephen Grimmer back in April
2001. I don't know the final temperature Stephen fires to. I do know
that Celadons are at their best when slightly underfired. Maybe he does
stop at cone 8.
Again, my apologies for the goof up.
Matt
-----Original Message-----
From: Michele Williams [mailto:fape4kids@NETZERO.NET]=20
Sent: Friday, May 17, 2002 7:14 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: Light Blue Celadon
You said "Fire to Cone 8 very slowly." Is that all or are we then to go
to cone 10 as the celadon recipes I've collected show?
Michele Williams
----- Original Message -----
From: "Matt MacIntire"
To:
Sent: Friday, May 17, 2002 11:25 AM
Subject: Re: Light Blue Celadon
-----Original Message-----
From: Stephen Grimmer [mailto:grimmer@MIDWEST.NET]
Sent: Monday, April 30, 2001 7:58 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Re: Light Blue Celadon
Jim,
This one is pretty good. That's a potash feldspar in there.
Different spars give different results. I hear Fukushima feldspar from
Japan is outstanding. Try with any feldspar you can get ahold of. If
your bentonite isn't really clean, I would try V-Gum T instead. A little
HCl will help suspend this, too. Celadons are very sensitive to firing
differences. Reduce early, reduce often! Try firing to cone 8 very
slowly.
I have developed some high Ba celadons that are REALLY blue, but
have not tested them for release. You could easily re-calculate this one
with BaCO3 and get a glaze the color of pre-washed denim.
Steve
Kawaii Celadon
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
G-200 FELDSPAR G200. 69.31 67.96%
WHITING............. 13.86 13.59%
FLINT............... 13.86 13.59%
BENTONITE........... 2.97 2.91%
*Red Iron............ 1.98 1.94%
=3D=3D=3D=3D=3D=3D=3D=3D
101.98
CaO 0.57* 9.48%
MgO 0.01* 0.11%
K2O 0.29* 8.12%
Na2O 0.12* 2.27%
TiO2 0.00 0.00%
Al2O3 0.48 14.47%
SiO2 3.69 65.38%
Fe2O3 0.00 0.17%
Cost/kg 0.07
Si:Al 7.67
SiB:Al 7.67
Expan 8.19
--
Stephen Grimmer
Southern Illinois University at Carbondale
> From: Jim Innes
> Subject: Light Blue Celadon
>
> I am looking for a light blue celadon for cone 10. I have tried out=20
> about 20 so far but have not come up with what I want. Any help would=20
> be much appreciated. Jim
________________________________________________________________________
______
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.
________________________________________________________________________
____
__
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.
________________________________________________________________________
______
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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