Omer Artun on tue 29 oct 96
My girldfriend just got me the Potter's Palette as a present. It looks wonderfu
But the problem is I want to downgrade the cone 10 recipe that the oxides tried
cone 6 the recipe given in the book is as follows
( I hope I am not violating any copyright laws)
Cone 10 Base
(Recipe C in the Book)
Potash Feldspar 50
Dolomite 20
China Clay 20
Bone Ash 10
I was thinking along the lines of decreasing the China clay to 13% and
add flint as filler instead as 7% .(Since there is plenty of flux.)
Is this a reasonable adjustment?
Of Course I will test test test......
-----------------------------------------------------------------------------
OMER BERAT ARTUN
-----------------------------------------------------------------------------
Institute for Brain and tel: 401 421 2879 (home)
Neural Systems, 401 863 3920 (office)
Department of Physics 401 863 3494 (fax)
Box 1843
Brown University URL: http://www.physics.brown.edu/people/artun
Providence RI 02912 e-mail: artun@cns.brown.edu
-----------------------------------------------------------------------------
Jonathan Kaplan on wed 30 oct 96
>----------------------------Original message----------------------------
>
>
>
>My girldfriend just got me the Potter's Palette as a present. It looks
>wonderfu
>But the problem is I want to downgrade the cone 10 recipe that the oxides tried
>cone 6 the recipe given in the book is as follows
>
>( I hope I am not violating any copyright laws)
>
>
>Cone 10 Base
>(Recipe C in the Book)
>
>Potash Feldspar 50
>Dolomite 20
>China Clay 20
>Bone Ash 10
>
>
>
>I was thinking along the lines of decreasing the China clay to 13% and
>add flint as filler instead as 7% .(Since there is plenty of flux.)
>
>
>Is this a reasonable adjustment?
>
>Of Course I will test test test......
>
>
>-----------------------------------------------------------------------------
> OMER BERAT ARTUN
>-----------------------------------------------------------------------------
>Institute for Brain and tel: 401 421 2879 (home)
>Neural Systems, 401 863 3920 (office)
>Department of Physics 401 863 3494 (fax)
>Box 1843
>Brown University URL: http://www.physics.brown.edu/people/artun
>Providence RI 02912 e-mail: artun@cns.brown.edu
>-----------------------------------------------------------------------------
In order to achieve a balanced glass, you need to calculate your glaze and
work on a molecular level rather than flying by the seat of your pants and
adjusting percentages. Which, btw, may work, but in no way reflects
anything to do with limit formulas and the absolute necessity to understand
the oxide relationships in a glaze system..In no way is this meant as a
criticism, only once again, I seem to be readign lots of daily posts, some
of which IMHO contain misinformation and are ultimatley, of little benefit.
Insight Glaze Software and Hyperglaze are two very reasonalby priced
programs for both platforms that are of immeasurable benefit.
Jonathan
Jonathan Kaplan
http://www.craftweb.com/org/jkaplan/cdg.shtml
(aka "Scooter)
jonathan@csn.net
Ceramic Design Group Ltd./Production Services Voice:
970-879-9139 POB 775112
FAXmodem: same
Steamboat Springs, Colorado 80477, USA CALL before faxing
"Arrive on time, tell the truth, be a good listener, and don't
be too attatched to the results. Above all, maintain a sense of
humor!"
Jim Connell or set clayart mail on wed 30 oct 96
WINTHROP UNIVERSITY Electronic Mail Message
Date: 30-Oct-1996 01:40pm EDT
From: James Connell
CONNELLJ
Dept: Art and Design
Tel No: 323-2126
TO: SMTP%"CLAYART@lsv.uky.edu" ( _SMTP%"CLAYART@lsv.uky.edu" )
Subject: RE: lowering the maturing temp of ^10 Glaze
Simply substitute the potash feldspar for Neph Sy feldspar. Most cone 10 glazes
can be lowered to cone 6 with this simple adjustment.
Jim
Marcia Selsor & Matt Benacquista on fri 1 nov 96
Jim Connell or set clayart mail wrote:
>
> ----------------------------Original message----------------------------
>
> Simply substitute the potash feldspar for Neph Sy feldspar. Most cone 10 glaz
> can be lowered to cone 6 with this simple adjustment.
>
> Jim
Ceramics Monthly suggested adding 10% Gerstley Borate in addition to the
substitution of Neph. Syn. for the Feldspar. I've tried this and
it works just fine.
Marcia in Montana
--
Marci Selsor
Matt Benacquista
http://www.imt.net/~mjbmls/
mjbmls@imt.net
Kerr - M. Christine on fri 1 nov 96
since your glaze has a lot of potash feldspar in it, one easy way to
lower the maturing temp is to sub soda feldspar. thats no substitute for
doing proper glaze calcualtions, but it works often enough to be worth a try.
On Wed, 30 Oct 1996, Jonathan Kaplan wrote:
> ----------------------------Original message----------------------------
> >----------------------------Original message----------------------------
> >
> >
> >
> >My girldfriend just got me the Potter's Palette as a present. It looks
> >wonderfu
> >But the problem is I want to downgrade the cone 10 recipe that the oxides tri
> >cone 6 the recipe given in the book is as follows
> >
> >( I hope I am not violating any copyright laws)
> >
> >
> >Cone 10 Base
> >(Recipe C in the Book)
> >
> >Potash Feldspar 50
> >Dolomite 20
> >China Clay 20
> >Bone Ash 10
> >
> >
> >
> >I was thinking along the lines of decreasing the China clay to 13% and
> >add flint as filler instead as 7% .(Since there is plenty of flux.)
> >
> >
> >Is this a reasonable adjustment?
> >
> >Of Course I will test test test......
> >
> >
> >-----------------------------------------------------------------------------
> > OMER BERAT ARTUN
> >-----------------------------------------------------------------------------
> >Institute for Brain and tel: 401 421 2879 (home)
> >Neural Systems, 401 863 3920 (office)
> >Department of Physics 401 863 3494 (fax)
> >Box 1843
> >Brown University URL: http://www.physics.brown.edu/people/artu
> >Providence RI 02912 e-mail: artun@cns.brown.edu
> >-----------------------------------------------------------------------------
>
>
> In order to achieve a balanced glass, you need to calculate your glaze and
> work on a molecular level rather than flying by the seat of your pants and
> adjusting percentages. Which, btw, may work, but in no way reflects
> anything to do with limit formulas and the absolute necessity to understand
> the oxide relationships in a glaze system..In no way is this meant as a
> criticism, only once again, I seem to be readign lots of daily posts, some
> of which IMHO contain misinformation and are ultimatley, of little benefit.
>
> Insight Glaze Software and Hyperglaze are two very reasonalby priced
> programs for both platforms that are of immeasurable benefit.
>
> Jonathan
>
>
> Jonathan Kaplan
> http://www.craftweb.com/org/jkaplan/cdg.shtml
>
>
> (aka "Scooter)
> jonathan@csn.net
> Ceramic Design Group Ltd./Production Services Voice:
> 970-879-9139 POB 775112
> FAXmodem: same
> Steamboat Springs, Colorado 80477, USA CALL before faxin
>
>
>
> "Arrive on time, tell the truth, be a good listener, and don't
> be too attatched to the results. Above all, maintain a sense of
> humor!"
>
PJLewing@aol.com on sat 2 nov 96
Omer,
This may be one of those glaze recipes that just will not go down from ^10
all the way to ^6. The idea in adjusting the temperature of a glaze downward
is to keep the flux numbers the same and the alumina/ silica ratio the same,
and just move both the alumina and silica numbers downward till they reach
the same relative positions in their respective limit formulas. Your glaze
has a very low number for silica for a ^10 glaze, and calcium and magnesium
numbers in the high end.
If you were to lower the clay to 7 and not add any more silica, this would
come about as close as you easily could to doing this. This raises your
al/si ratio slightly, which is probably good anyway. But your amount of
calcium is relatively high for ^6 glaze and the magnesium is way high for ^6.
I would not expect dropping the clay to 7, either with or without the
addition of silica, to result in a satisfactory glaze. You probably need to
introduce more potassium and sodium, or another flux entirely, maybe some
boron, even. But then, it may not be the same quality. As Ken Stevens
always says, when you change the glaze, you change the glaze.
In my experience, very few glazes can be made to make as radical an
adjustment as 4 cones and retain their original quality. You also don't say
if you're going from ^10 reduction to ^6 oxidation, but many people try to do
this with their glazes, and it just complicates the process even more.
My advice- find a new glaze.
And you're right-TEST, TEST, TEST!
Paul Lewing, Seattle
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