Edouard Bastarache on thu 25 jul 02
Hey Tom,
for those you want to have access to my tested c/4 glazes,
go to the GlazeBase's Recent Submissions at
http://www.dinoclay.com/glzbase/gbrecent.html
the glazes names are in french but the rest of each file
is in english, I was asked to put a "french touch" to my
submissions since I live in Quebec (no sweat!!!).
Check in sets 10, 11, 12.
I also designed 63 c/3 base recipies but they have not been
tested so far by me; a job for my retirement. I did this
to help an art teacher to get rid of his leaded glazes.
I do not know which one he used but, I heard by a friend that those he
used were satisfactory but not as beautiful as his former
leaded glazes.
So, these recipies are not in GlazeBase's Recent Submissions.
A job for my retirement.
Later,
Edouard Bastarache
Irreductible Quebecois
Indomitable Quebeker
Sorel-Tracy
Quebec
edouardb@sorel-tracy.qc.ca
http://sorel-tracy.qc.ca/~edouardb/
http://perso.wanadoo.fr/smart2000/index.htm
----- Original Message -----
From: Tom Buck
To:
Sent: Thursday, July 25, 2002 1:09 PM
Subject: request for C3 glaze
> Ivor Lewis:
> Thank you for your comment on my request for a Cone THREE base
> glaze, and you are right, I seek a transparent shiny glaze recipe to
> mature at Cone Three.
> I cited the Watts Formula (Seger Formula) mainly to alert
> interested potters to the validity of the Seger (aka flux oxide Unity
> Formula) as a way of stating the makeup of a glaze, especially when the
> glaze has to travel across oceans.
> Perhaps you, others, have noted that more and more potters are
> providing both the Batch Recipe and the Seger when they cite a glaze on
> Clayart, allowing others to use their own raw materials to match the Seger
> and thus have a chance at being successful in reproducing the glaze on
> their pots. Which is why the two most recent books on Cone SIX glazes,
> Bailey's and Hesselberth/Roy's, make a departure from earlier practices;
> they both cite the Seger/Unity Formula with every Batch Recipe offered.
> BTW, Ivor, so far only four potters have responded to my request,
> and one, Doc B., cited a set of C4 glazes he designed some years back for
> me to test. The other recipes would likely not produce a gloss transparent
> glaze at C3.
> still it's a start. be well. Peace. Tom B.
>
> Tom Buck ) -- primary address. > at hwcn.org> "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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Tom Buck on thu 25 jul 02
Ivor Lewis:
Thank you for your comment on my request for a Cone THREE base
glaze, and you are right, I seek a transparent shiny glaze recipe to
mature at Cone Three.
I cited the Watts Formula (Seger Formula) mainly to alert
interested potters to the validity of the Seger (aka flux oxide Unity
Formula) as a way of stating the makeup of a glaze, especially when the
glaze has to travel across oceans.
Perhaps you, others, have noted that more and more potters are
providing both the Batch Recipe and the Seger when they cite a glaze on
Clayart, allowing others to use their own raw materials to match the Seger
and thus have a chance at being successful in reproducing the glaze on
their pots. Which is why the two most recent books on Cone SIX glazes,
Bailey's and Hesselberth/Roy's, make a departure from earlier practices;
they both cite the Seger/Unity Formula with every Batch Recipe offered.
BTW, Ivor, so far only four potters have responded to my request,
and one, Doc B., cited a set of C4 glazes he designed some years back for
me to test. The other recipes would likely not produce a gloss transparent
glaze at C3.
still it's a start. be well. Peace. Tom B.
Tom Buck ) -- primary address. at hwcn.org> "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
John Post on fri 26 jul 02
Hi Tom,
It seems that the recipes that were posted on clayart did meet the Seger
formula that you proposed... of course Ivor had a few suggestions for adding
boron and lithium to reduce crazing which then of course changes the
original Seger formula.
I guess what I'm wondering then, is it really possible to use the Seger
formula that you proposed to get a gloss transparent at cone 3? I played
with Glazchem for a few minutes and came up with the following recipe...
++++++++++++++++++
+++ Cone 3 +++
++++++++++++++++++
Date: 07/25/02
Frit 3110 20 20 %
Custer feldspar 36 36 %
Whiting 6 6 %
Zinc oxide 6.7 6.7%
EPK 22.3 22.3%
Flint 9 9 %
-------- ------
100 100 %
===========================
Chemical Analysis
===========================
Na2O 0.24 Al2O3 0.56 SiO2 3.50
K2O 0.16 B2O3 0.03
CaO 0.30
ZnO 0.30
Alumina:Silica ratio is 1.00 : 6.28
Neutral:Acid ratio is 1.00 : 5.99
Alkali:Neutral:Acid ratio is 1.00 : 0.58 : 3.50
Expansion coefficient: 78.0 x 10e-7 per degree C
Oxides causing abnormal expansion effects: B2O3
I like this recipe over the others because it has more clay in it which will
produce a better slurry. It also has some frit in it which should help to
make it melt more readily at cone 3.
Of course the expansion seems a little high to me. If I was trying to
generate a cone 3 glossy from scratch, I would probably use Ian Currie's
grid method, that way I could see what is really happening regarding clay
body fit as the alumina and silica values change.
Maybe it's not possible to make a cone 3 glossy with the unity formula you
proposed, maybe Ivor is correct in that some other fluxes have to be
included to get it to melt and fit the clay body. Running a couple of
Currie grids would probably find this out...
Cheers,
John Post
-----Original Message-----
The other recipes would likely not produce a gloss transparent
glaze at C3.
still it's a start. be well. Peace. Tom B.
Tom Buck ) -- primary address. at hwcn.org> "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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