Barrie Paine on wed 17 may 00
Barrie Paine
Nelson Creek Pottery
Nelson Creek
RD Dobson
West Coast
NEW ZEALAND
www.barriepaine.com
Can anyone help me obtain a pale =
green Celerdon glaze to cone 10-11
over a white body gas fired,or give me some interesting alternitives.
Cheers from NZ
John & Anne Worner on wed 17 may 00
Hi Barrie,
We have tried the following and found it very good, velvety and smooth.
If you want a bluer celedon, change the EPK to China Clay.
Michel Lemire Celedon ^10 RX
==========================================
CUSTER FELDSPAR..... 42.80 42.80%
FLINT............... 27.80 27.80%
EPK KAOLIN.......... 10.40 10.40%
WOLLASTONITE........ 19.00 19.00%
========
100.00
CaO 0.72* 10.40%
MgO 0.01* 0.07%
K2O 0.19* 4.55%
Na2O 0.08* 1.28%
TiO2 0.00 0.05%
Al2O3 0.45 11.83%
P2O5 0.00 0.03%
SiO2 4.64 71.54%
Fe2O3 0.01 0.24%
MnO 0.00* 0.02%
Cost/kg 0.76
Si:Al 10.26
SiB:Al 10.26
Expan 6.83
Notes:
Colorant: for RX: 0.25 to 2% RIO
Another one that I tested is 4 Star Celedon, found in the
SDSU archives. I have altered this one slightly:
****Celedon Revised and tested
==============================================
CUSTER FELDSPAR..... 30.00 30.00%
WHITING............. 10.00 10.00%
WOLLASTONITE........ 10.00 10.00%
EPK KAOLIN.......... 20.00 20.00%
FLINT............... 30.00 30.00%
========
100.00
CaO 0.81* 12.57%
MgO 0.00* 0.05%
K2O 0.13* 3.43%
Na2O 0.06* 0.96%
TiO2 0.00 0.09%
Al2O3 0.49 14.01%
P2O5 0.00 0.05%
SiO2 4.11 68.54%
Fe2O3 0.01 0.27%
MnO 0.00* 0.01%
Cost/kg 0.65
Si:Al 8.30
SiB:Al 8.30
Expan 6.70
Notes:
Colorants for RX: from .25 to 2.0 RIO
Nice slurry, stays suspended.
Hope this helps,
Anne
Barrie Paine wrote:
>
> Barrie Paine
> Nelson Creek Pottery
> Nelson Creek
> RD Dobson
> West Coast
> NEW ZEALAND
> www.barriepaine.com
> Can anyone help me obtain a pale green Celerdon glaze to cone 10-11
> over a white body gas fired,or give me some interesting alternitives.
> Cheers from NZ
>
> ______________________________________________________________________________
> 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.
Hank Murrow on wed 17 may 00
>Barrie Paine
>Nelson Creek Pottery
>Nelson Creek
>RD Dobson
>West Coast
>NEW ZEALAND
>www.barriepaine.com
> Can anyone help me obtain a pale green
>Celerdon glaze to cone 10-11
>over a white body gas fired,or give me some interesting alternitives.
> Cheers from NZ
>
Dear Barrie; Look for an unaltered Rhyolite with low Titania content and
ball-mill it with 5% Talc and 5% Wollastonite. If it has any plasticity,
you can glaze green with it as I do. Maybe michael Banks can direct you to
a suitable rock. Hank in Eugene
Cantello Studios on wed 17 may 00
ange: ^10 \ ^11
Firing type: Ox. or Red.
Glaze type: Celadon
Surface: Gloss
Transparency: Transparent
Crystals: None
Bubbles: None
Flow: None
Flaws: none
Durability: Good
Testing: V/O
Date: 02/12/99
G-200 27.51 27.5%
Whiting 19.6 19.6%
EPK 19.97 20 % Hazard!
Flint 32.93 32.9% Hazard!
-------- ------
100 100 %
Red iron oxide 1 1 %
Bentonite 1 1 % Hazard!
Variations:
1% iron=light green 1.5% for dark green.
vivika said that 1%=.01? my?.01 dose not sound right.
Notes:
good clear with out iron good with oxide over,
like vivika cobalt over clear on porcelin.
Material Hazards:
EPK - dust hazard
Flint - dust hazard
Bentonite - dust hazard
Cost: $ 0.59 per kg glaze
$ 0.06 per 100 g batch
===========================
Chemical Analysis
===========================
This glaze contains unexpected oxides: SiO2
Na2O 0.06 Al2O3 0.54 TiO2 0.00
K2O 0.12 Fe2O3 0.03
MgO 0.00
CaO 0.82
Alumina:Silica ratio is 1.00 : 7.70
Neutral:Acid ratio is 1.00 : 0.05
Alkali:Neutral:Acid ratio is 1.00 : 0.54 : 0.03
Na2O 1.0% Al2O3 14.8% TiO2 0.0%
K2O 3.2% Fe2O3 1.1%
MgO 0.0%
CaO 12.5%
This glaze also contains:
SiO2 67.4%
Loss On Ignition: 11.2%
Expansion coefficient: 67.1 x 10e-7 per degree C
Viscosity index: 1.1
Surface Tension index: 3.2
Onset of oxide volatization:
H2O 100 C (complete loss)
CO,CO2 700 C (c/018) (complete loss)
Na2O 1100 C (c/02) (partial loss)
K2O 1200 C (c/6) (slight loss)
Materials in glaze:
G-200 Feldspar provides SiO2, Al2O3, K2O, Na2O, and CaO.
Whiting provides CaO.
EPK provides SiO2 and Al2O3.
Flint provides SiO2.
Red iron oxide provides Fe2O3. Used as a colorant.
Bentonite provides several oxides. Ususally used as a suspending agent.
Oxides in glaze:
Na2O is a strong alkaline flux.
K2O is a strong alkaline flux.
MgO is a high-temperature flux.
CaO is a high-temperature flux.
Al2O3 increases viscosity, prevents crystallization, and adds durability.
TiO2 adds opacity and encourages crystal formation.
Fe2O3 is a colorant (tan, yellow, brown, red, and black).
In reduction, Fe2O3 -> FeO, which is a flux and colorant (brown, black).
SiO2 is the primary glass-former in glazes.
=======================
Cost Summary
=======================
G-200 27.5% $ 0.15 per kg glaze
Whiting 19.6% $ 0.11
EPK 20 % $ 0.11
Flint 32.9% $ 0.18
------ -------
100 % $ 0.55 per kg glaze
Red iron oxide 1 % $ 0.03 per kg glaze
Bentonite 1 % $ 0.01
-------
$ 0.04 per kg glaze
Total cost: $ 0.59 per kg glaze
$ 0.06 per 100 g batch Very Good from Vivika Heion
-----Original Message-----
From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.CERAMICS.ORG]On
Behalf Of Barrie Paine
Sent: Wednesday, May 17, 2000 1:24 AM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Glaze Required
Barrie Paine
Nelson Creek Pottery
Nelson Creek
RD Dobson
West Coast
NEW ZEALAND
www.barriepaine.com
Can anyone help me obtain a pale green
Celerdon glaze to cone 10-11
over a white body gas fired,or give me some interesting alternitives.
Cheers from NZ
____________________________________________________________________________
__
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.
Stephen Grimmer on wed 17 may 00
Barrie,
This is a pretty reliable greenish celadon in reduction. Oxidation gives
a nice yellow. Custer Feldspar is a potash feldspar. Grolleg is a low
titania English kaolin. Higher titania kaolins give greener glazes. The
expansion is pretty low for this glaze; you may need to drop the silica in
5% increments to get the fit you want. For a bluer celadon, drop the
dolomite and use 20 whiting.
Other variations: Vary the iron through the range: .5%-4%; do the same
with any red clay instead of iron oxide; drop the kaolin completely;
directly substitute other feldspars; substitute anything else you think of.
Steve Grimmer
Marion, Illinois
PBC Revised
===========
CUSTER FELDSPAR..... 25.00 24.27%
SILICA.............. 35.00 33.98%
DOLOMITE............ 10.00 9.71%
WHITING............. 10.00 9.71%
GROLLEG KAOLIN...... 20.00 19.42%
*Tin Oxide........... 1.00 0.97%
Fe2O3............... 2.00 1.94%
========
103.00
CaO 0.61* 9.68%
MgO 0.22* 2.49%
K2O 0.12* 3.26%
Na2O 0.05* 0.83%
TiO2 0.00 0.01%
Al2O3 0.45 12.97%
SiO2 4.03 68.37%
Fe2O3 0.05 2.40%
Cost/kg 0.11
Si:Al 8.95
SiB:Al 8.95
Expan 6.41
----------
>From: Barrie Paine
>To: CLAYART@LSV.CERAMICS.ORG
>Subject: Glaze Required
>Date: Wed, May 17, 2000, 3:24 AM
>
>Barrie Paine
>Nelson Creek Pottery
>Nelson Creek
>RD Dobson
>West Coast
>NEW ZEALAND
>www.barriepaine.com
> Can anyone help me obtain a pale green
>Celerdon glaze to cone 10-11
>over a white body gas fired,or give me some interesting alternitives.
> Cheers from NZ
>
>______________________________________________________________________________
>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.
>
Lawrence Ewing on thu 18 may 00
Hi Barrie,
If you go to the Matrix website at http://www.Matrix2000.co.nz you will find
a link to some glaze research by Tina Hendriks and Namsook Chang.
The direct URL is http://www.matrix2000.co.nz/TinaLuxBlend/TinaLux.htm
These students used Matrix to generated a glaze blend which examines the the
results of varying clay and silica in a celedon glaze. You can see the
glazes as thumbnail and larger images. The recipe and unity formula for each
of the glazes are listed. There are some interesting glazes in this
collection. If the intensity of green is too dark for you simply reduce the
% of iron oxide in the recipe.
Regards,
Lawrence Ewing
Senior Lecturer
Ceramics Department
School of Art
Otago Polytechnic
Dunedin
New Zealand
email: lewing@clear.net.nz
MATRIX GLAZE CALCULATION SOFTWARE:
http://www.Matrix2000.co.nz
GLAZETEACH:
http://www.Matrix2000.co.nz/GlazeTeach
MATRIX TUTORIALS:
http://www.Matrix2000.co.nz/MatrixTutorials
MATRIX ADDITIONAL MATERIALS RESOURCE:
http://www.Matrix2000.co.nz/MatrialsWeb/default.htm
-----Original Message-----
From: Ceramic Arts Discussion List [mailto:CLAYART@LSV.CERAMICS.ORG]On
Behalf Of Barrie Paine
Sent: Wednesday, May 17, 2000 8:24 PM
To: CLAYART@LSV.CERAMICS.ORG
Subject: Glaze Required
Barrie Paine
Nelson Creek Pottery
Nelson Creek
RD Dobson
West Coast
NEW ZEALAND
www.barriepaine.com
Can anyone help me obtain a pale green
Celerdon glaze to cone 10-11
over a white body gas fired,or give me some interesting alternitives.
Cheers from NZ
____________________________________________________________________________
__
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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