John Rodgers on sat 18 jan 03
A while back, somewhere, I came across a recipe for a cone 5-6 glaze
called Floating Red. I made some notes but I regret that I failed to get
the name of the person who contributed it. One of my notes says
substitute feldspar for 50% of the Gerstley Borate to reduce running. My
question is: Which Feldspar?? Potash or other???
Here is the recipe as I recorded it.
Floating Red - Cone 5-6 - Not known to be food safe - For Decorating Only
(all numbers expressed as % by weight)
Gerstley B 55
Talc 15
Silica 30
Total 100
Add:
RIO 22
Substitute Feldspar for up to 50 % of the Gerstley Borate to reduce running.
If anyone can claim to be the original contributor of this glaze, I
would really like to acknowledge your contribution.
If anyone has worked with this glaze, and knows what kind of feldspar is
used to substitute for some of the GB, please let me know. I really
would like to try this glaze, but not before I have all the ingredients
nailed!! I can experiment, but I want to start close, and then expand
the experiments.
Thanks,
John Rodgers
Birmingham, AL
Jim Brooks on mon 20 jan 03
j_Rodgers.. this will work with potash feldspar... but i have been using this
for years by reducing the GB to 45%, and adding 10% EPK..It stopped the
running and retains the great red color.. Jim in
Denton
Alisa Liskin Clausen on mon 20 jan 03
Dear John,
I tested this glaze as is, the recipe you have and
with all of the GB replaced by my local frit (analysis is in the archives)
and with the GB replaced with Colemanite.
They were all right, a brown glaze with a lot of iron red spots and pools.
I had generally noticed that more than 20% Colemanite subbed for GB resulted
in drier
glazes. However, it worked with the recipe you have, maybe because the RIO
content is so high.
Also, in my experience, I have not found large variances, if any, using
different Feldspars. I use the same
Feldspar in all my recipes, which is Forshammer, a sort of half way Feldspar
between soda and potash.
Of course, I am sure there are recipes that are very specific to the
Feldspar used (?).
In my notes I have written that this glaze was nice as an accent glaze over
non food surfaces.
I do not use it however.
good luck, Alisa in Denmark
Ababi on tue 11 feb 03
Hello John
In my systems the computer's actually I have this glaze was sent by Marty Anderson
who brought us the yellow butterscotch and other lovely glaze:
JO'S RED ^6
Gerstley Borate 45
EPK 10
Talc 15
Flint 30
Add:
Red Iron Oxide 22
BEST COLOR IN OXIDATION
Sound familiar?
I was surprised 22% red iron oxide!
Yes 22% of brown glaze
The only different I can see is the add of the kaolin. You might of try it on the other
hand if that glaze meant to be runny let it run!
The way it looks in your recipe I would decrease the RIO to 5 and try it in raku!
Ababi Sharon
Glaze addict
Kibbutz Shoval Israel
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910/
---------- Original Message ----------
>A while back, somewhere, I came across a recipe for a cone 5-6 glaze
>called Floating Red. I made some notes but I regret that I failed to get
>the name of the person who contributed it. One of my notes says
>substitute feldspar for 50% of the Gerstley Borate to reduce running. My
>question is: Which Feldspar?? Potash or other???
>Here is the recipe as I recorded it.
>Floating Red - Cone 5-6 - Not known to be food safe - For Decorating Only
>(all numbers expressed as % by weight)
>Gerstley B 55
>Talc 15
>Silica 30
> Total 100
>Add:
>RIO 22
>Substitute Feldspar for up to 50 % of the Gerstley Borate to reduce running.
>If anyone can claim to be the original contributor of this glaze, I
>would really like to acknowledge your contribution.
>If anyone has worked with this glaze, and knows what kind of feldspar is
>used to substitute for some of the GB, please let me know. I really
>would like to try this glaze, but not before I have all the ingredients
>nailed!! I can experiment, but I want to start close, and then expand
>the experiments.
>Thanks,
>John Rodgers
>Birmingham, AL
>______________________________________________________________________________
>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.
Don Goodrich on wed 12 feb 03
Hello Ababi,
Seems to me it was Omer Artun who posted that high-iron Floating Red recipe
to Clayart some years ago. I tried it, but it needed to be really thick to
work and was runny.
I've been toying with variations of a Weiser's Honey recipe that R.
Wuetherick posted here on 24 October 1996:
http://lsv.ceramics.org/scripts/wa.exe?A2=ind9610&L=clayart&D=1&O=D&P=99994
I did a little tinkering and found that with copper, it makes a pretty good
^5-6 Floating Green or, as I call it,
Frogskin ^6 ox:
22 Custer feldspar
22 Gerstley Borate
22 Nepheline syenite
26 Flint
3 Wollastonite
3 EPK
2 Titanium dioxide
3 RIO
4 Copper carbonate
But I wonder if it would serve as a chrome-tin red if, instead of the RIO and
Copper, one were to substitute:
5 TIN OXIDE
0.15 GREEN CHROME OXIDE
But I haven't tried it yet. Will let you all know when I do.
Cheers,
Don Goodrich in suddenly snowy Zion, Illinois
goodrichdn@aol.com
http://members.aol.com/goodrichdn/
Ababi on fri 14 feb 03
Hello Don
^5-6 FLOATING GREEN
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Cone 6 1222 deg.C. -
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Custer feldspar 22.00
GB Average 22.00
Nepheline Syenite 22.00
Wollastonite 26.00
EPK Kaolin 3.00
Titanium Dioxide 2.00
Red Iron Oxide 3.00
Copper carbonate 4.00
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Seger Weight%
KNO 0.234 7.93%
CaO 0.694 17.88%
MgO 0.072 1.32%
Al2O3 0.256 11.96%
P2O5 0.000 0.01%
B2O3 0.22 4 7.16%
SiO2 1.845 50.93%
TiO2 0.076 2.80%
K2O 0.085 3.68%
Na2O 0.150 4.26%
Al:Si 7.22
Expan. 8.82
ST 350.36
It looks like it will give you the red, according to Tony Hansen you need 10% CaO
and low MgO. I do not remember where I read about the relation between the B2O3
and the CaO Looking in a recipe of Will Eduard makes me think you might succeed.
Ababi Sharon
Glaze addict
Kibbutz Shoval Israel
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910/
http://www.milkywayceramics.com/cgallery/asharon.htm
and also
http://www.israel-ceramics.org/membersGallery/personalpage.asp?MID=507
---------- Original Message ----------
>Hello Ababi,
> Seems to me it was Omer Artun who posted that high-iron Floating Red recipe
>to Clayart some years ago. I tried it, but it needed to be really thick to
>work and was runny.
> I've been toying with variations of a Weiser's Honey recipe that R.
>Wuetherick posted here on 24 October 1996:
>http://lsv.ceramics.org/scripts/wa.exe?A2=ind9610&L=clayart&D=1&O=D&P=99994
> I did a little tinkering and found that with copper, it makes a pretty good
>^5-6 Floating Green or, as I call it,
> Frogskin ^6 ox:
> 22 Custer feldspar
> 22 Gerstley Borate
> 22 Nepheline syenite
> 26 Flint
> 3 Wollastonite
> 3 EPK
> 2 Titanium dioxide
> 3 RIO
> 4 Copper carbonate
>But I wonder if it would serve as a chrome-tin red if, instead of the RIO and
>Copper, one were to substitute:
> 5 TIN OXIDE
> 0.15 GREEN CHROME OXIDE
>But I haven't tried it yet. Will let you all know when I do.
> Cheers,
> Don Goodrich in suddenly snowy Zion, Illinois
>goodrichdn@aol.com
>HREF="http://members.aol.com/goodrichdn/">http://members.aol.com/goodrichdn/
>______________________________________________________________________________
>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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