John McCain on sat 15 mar 97
In response to Kollin Baker's reguest for a good Cone 03+/- white
crackle glaze that does not require P-3111 frit, I offer the following:
1. Gerstley Borate 82%, Cornwall Stone 18%
2. Gerstley Borate 80%, Nephelene Syenite 20%
3. Gerstley Borate 70%, Talc 30%
4. Gerstley Borate 82%, Cornwall Stone 9%, Ball Clay 9%
5. Gerstley Borate 82%, Ball Clay 9%, Zircopax Plus 9%
6. Gerstley Borate 40%, Luspar 34%, Barium Carbonate 15%, Flint 11%
7. Gerstley Borate 48%, Nephelene Syenite 25%, Barium Carbonate 10%,
Tin Oxide 7%, Zircopax 10%
We use formulation 5 since it was the first Gerstley Borate white
crackle we ran across years ago. We have tested several of the other
formulations at Cone 06+/-.
Regards,
John McCain
Palo Pinto Pottery
Karen Weiss on wed 22 dec 99
Dear Everyone, I am looking for a recipe for a white crackle raku glaze
without colemanite/gerstley borate.Does such an animal exist ? The kiln that
I use tends to reduce while firing, and as anyone who has worked with glazes
containing the above will know, reduction makes the glaze bubble like billy-
o.The result looks like a lava flow. I would also appreciate people's firing
schedules for a raku firing as I am still working this out- Best wishes to
all for a great Millenium - make it a good one !!!! Karen
Richard Jeffery on thu 23 dec 99
Karen
Not sure what you mean by a firing schedule - sorry, it's very close to the
time of year when my brain shuts down until the sky goes blue again.
Do you mean how long/how fast to fire? If so, you may be making life
complicated for yourself. It does depend on how robust your ware is, I
suppose, and certainly it will be different for the first load which can
start from cold, rather than subsequent that go in hot.
Richard
Bournemouth UK - where I was looking forward to seeing that moon, and we've
got the same weather we had for the eclipse...
> -----Original Message-----
> From: Ceramic Arts Discussion List
> [mailto:CLAYART@LSV.UKY.EDU]On Behalf
> Of Karen Weiss
> Sent: 22 December 1999 14:04
> To: CLAYART@LSV.UKY.EDU
> Subject: white crackle raku glaze
>
>
> ----------------------------Original
> message----------------------------
> Dear Everyone, I am looking for a recipe for a white crackle
> raku glaze
> without colemanite/gerstley borate.Does such an animal exist
> ? The kiln that
> I use tends to reduce while firing, and as anyone who has
> worked with glazes
> containing the above will know, reduction makes the glaze
> bubble like billy-
> o.The result looks like a lava flow. I would also appreciate
> people's firing
> schedules for a raku firing as I am still working this out-
> Best wishes to
> all for a great Millenium - make it a good one !!!! Karen
>
Stephen Mills on mon 27 dec 99
I've come to this a bit late but here is my favourite:
Anyone's Calcium Borate Fritt...........42 parts by weight
Anyone's Standard Borax Fritt...........42 ditto
China Clay..............................16 ditto
To this add 5 percent Tin Oxide. This makes a nearly opaque white Raku
glaze which allows some of the body colour to soften what would
otherwise be a boring white glaze with craze marks. Looks great when
brushed on with a coarse bristle brush.
Or you could use:
Any High Alkaline Fritt................85 PBW
China Clay.............................15
plus tin as above.
Fire 'till it (they) look like really runny Golden Syrup!
Steve
Bath
UK
In message , Karen Weiss writes
>----------------------------Original message----------------------------
>Dear Everyone, I am looking for a recipe for a white crackle raku glaze
>without colemanite/gerstley borate.Does such an animal exist ? The kiln that
>I use tends to reduce while firing, and as anyone who has worked with glazes
>containing the above will know, reduction makes the glaze bubble like billy-
>o.The result looks like a lava flow. I would also appreciate people's firing
>schedules for a raku firing as I am still working this out- Best wishes to
>all for a great Millenium - make it a good one !!!! Karen
>
--
Steve Mills
Bath
UK
home e-mail: stevemills@mudslinger.demon.co.uk
work e-mail: stevemills@bathpotters.demon.co.uk
own website: http://www.mudslinger.demon.co.uk
BPS website: http://www.bathpotters.demon.co.uk
Tel: **44 (0)1225 311699
Fax: **44 (0)870 0526466
Karin Hurt on sun 15 oct 06
has anyone ever used this recipe and with what results?
75% Gerstley Borate
25% Cornwall Stone
we used it in school with good results, when I mixed it at home and used it, it didn't do so well. Can you share your results please?
Karin
www.mojavemountainpottery.com
---------------------------------
All-new Yahoo! Mail - Fire up a more powerful email and get things done faster.
Russell Sheptak on sun 15 oct 06
First, that would be a clear crackle raku recipe, not a white crackle.
I use something similar:
80 Gerstley Borate
20 Cornwall Stone
It has a coefficient of expansion of 8.57 as calculated by Insight,
slightly higher than your recipe (at 8.42) so it should crackle more
than yours did. It crackles on some of our clays (a cone 6 porcelain
and stoneware) but not all of them. This forms a wonderful base for
adding oxides to get colored raku glazes, although, depending on the
colorant, it may not crackle (chrome oxide and cobalt carbonate seem to
not crackle, copper carbonate and black nickel do).
Another raku clear crackle I've used is
80 Gerstley Borate
20 Nepheline Syenite
Coefficient of expansion of 9.42 so it crackles even better. It
crackles well on all three of our studio clays, but is not as colorful
when adding oxides.
rus
----------------------
Rus Sheptak rus@sonic.net
On Oct 15, 2006, at 10:05 AM, Karin Hurt wrote:
> has anyone ever used this recipe and with what results?
>
> 75% Gerstley Borate
> 25% Cornwall Stone
>
> we used it in school with good results, when I mixed it at home and
> used it, it didn't do so well. Can you share your results please?
>
>
> Karin
> www.mojavemountainpottery.com
>
> ---------------------------------
> All-new Yahoo! Mail - Fire up a more powerful email and get things
> done faster.
>
> _______________________________________________________________________
> _______
> 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.
>
>
Karin Hurt on sun 15 oct 06
Thank You Russell, and I stand corrected, yes it is a clear crackle, sorry. I'll try your recipie next time.
Russell Sheptak wrote:
First, that would be a clear crackle raku recipe, not a white crackle.
I use something similar:
80 Gerstley Borate
20 Cornwall Stone
It has a coefficient of expansion of 8.57 as calculated by Insight,
slightly higher than your recipe (at 8.42) so it should crackle more
than yours did. It crackles on some of our clays (a cone 6 porcelain
and stoneware) but not all of them. This forms a wonderful base for
adding oxides to get colored raku glazes, although, depending on the
colorant, it may not crackle (chrome oxide and cobalt carbonate seem to
not crackle, copper carbonate and black nickel do).
Another raku clear crackle I've used is
80 Gerstley Borate
20 Nepheline Syenite
Coefficient of expansion of 9.42 so it crackles even better. It
crackles well on all three of our studio clays, but is not as colorful
when adding oxides.
rus
----------------------
Rus Sheptak rus@sonic.net
On Oct 15, 2006, at 10:05 AM, Karin Hurt wrote:
> has anyone ever used this recipe and with what results?
>
> 75% Gerstley Borate
> 25% Cornwall Stone
>
> we used it in school with good results, when I mixed it at home and
> used it, it didn't do so well. Can you share your results please?
>
>
> Karin
> www.mojavemountainpottery.com
>
> ---------------------------------
> All-new Yahoo! Mail - Fire up a more powerful email and get things
> done faster.
>
> _______________________________________________________________________
> _______
> 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.
Karin
www.mojavemountainpottery.com
---------------------------------
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