Ababi on tue 25 mar 03
It looks Bill that you entered to the room in the middle of the story;
The point was to take my best glaze that some people could not reproduce and
change some materials in order to let them try it. The page is:
http://members4.clubphoto.com/ababi306910/1190160/
So this is the whole story:
First I worked with Behrens's stony matte
STONY GREEN-BEHRENS
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Cone 6 1201 deg.C. -
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Bone Ash 6.40
Nepheline Syenite 27.60
Magnesium Carb Light 2.50
Wollastonite 14.00
ENGLISH KAOLIN CC31 16.00
STRONTIUM CARBONATE 33.50
Tin Oxide 5.00
COPPER OXIDE 3.00
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Seger Weight%
KNO 0.125 5.14%
CaO 0.344 11.11%
MgO 0.072 1.66%
SrO 0.459 27.32%
Al2O3 0.247 14.50%
P2O5 0.042 3.40%
SiO2 1.067 36.86%
K2O 0.037 2.00%
Na2O 0.088 3.14%
Al:Si 4.31
Expan. 9.42
ST 399.76
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
For examples see:
http://members4.clubphoto.com/ababi306910/186015/
Most of the green wares except the last three the egg shaped is this the glaze with
Earth and the next one has Pinnell 's weathered bronze.
I made a lot of tests kind of blends when I did not know how to use the volumetric
system!
Back to the story
KOREN 27
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Cone 5 1201 deg.C. - I fire of course to ^6
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Quartz 26.00
kaolin CC31 5.00
zinc oxide 10.00
Feldspar Soda F7 35.00
Calcium Carbonate 13.00
Barium Carbonate 9.00
,,,,All together 98 Yehuda says: 2% Bentonite his recipes page says 2% lithium
I used it as the 98%
Seger Weight%
KNO 0.160 3.38%
CaO 0.368 6.94%
BaO 0.128 6.58%
ZnO 0.344 9.41%
Al2O3 0.215 7.37%
SiO2 3.286 66.32%
K2O 0.005 0.15%
Na2O 0.155 3.23%
Al:Si 15.25
Expan. 6.99
ST 360.11
The next step changing the barium to strontium, for me and to whiting for my
students: The final results of this glaze see here
http://members4.clubphoto.com/ababi306910/912566/
The first slides
and here the whiting version results here
http://members4.clubphoto.com/ababi306910/1195866/
The green and the blue bowls.
The strontium base:
FOLLOW KOREN 27 2#
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Cone 6 1201 deg.C. -
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
SILICA 31.50
Calcium Carbonate 12.00
ENGLISH KAOLIN CC31 13.50
ZINC OXIDE 10.00
Nepheline Syenite 10.00
STRONTIUM CARBONATE 7.00
FRIT 3110 16.00
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Seger Weight%
KNO 0.182 5.13%
CaO 0.365 8.48%
MgO 0.001 0.01%
ZnO 0.327 11.02%
SrO 0.126 5.41%
Al2O3 0.204 8.61%
B2O3 0.016 0.46%
SiO2 2.443 60.87%
K2O 0.034 1.34%
Na2O 0.148 3.80%
Al:Si 11.99
Expan. 7.74
ST 367.64
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
I started to manipulate:
What will happen if I will increase the strontium to 20 in order to get nice turquoise?
It turned ugly. I removed the zinc
I changed as much as I could to flour bearing materials and got
S4a
Please see it at the first page I gave you. I do not keep it anymore.
As blue was interesting as green was lovely with many black dots.
The book....
I tested it for dishwasher: most of the dots vanished.
I removed the Fluorspar and got
ABABI'S S4B TURQUOISE
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Cone 6 1222 deg.C. -
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Quartz 25.20
kaolin CC31 30.50
strontium carbonate 15.70
Wollastonite 18.10
Cryolite 10.50
Tin Oxide 5.00
copper oxide 3.00
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Seger Weight%
KNO 0.236 4.60%
CaO 0.417 7.36%
MgO 0.021 0.26%
SrO 0.327 10.64%
Al2O3 0.422 13.53%
SiO2 3.367 63.62%
Na2O 0.236 4.60%
Al:Si 7.98
Expan. 7.55
ST 374.80
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Please note: Like the Behrens glaze it is matte you cannot use it for food, but unlike
the first one it does not leach.
I have more glazes of this kind: The Fish of gad is from leftovers I give to my students,
I think they are more beautiful than the glaze I use
Sincerely
Ababi
By the way, The high CaO and the search for a substitution for Cryolite led to another
base, Wollastonite base which the main use would be for Tin Chrome glaze...
but this will be latter there are two other glazes I want to write about before.
---------- Original Message ----------
>I noticed you last post Ababi about turquoise. I
>didn't get the chance to run it through calculations
>but I did see the soda level was low. Why not up that
>and get a more alkyline glaze base by changing spars
>or frits to increase it and see how your turquoise
>will look. NC-4 or Neph. Syenite might be a start?
>If you make this swap let me know, I am interested in
>seeing before and after pictures.
>Bill Edwards
>=====
>http://www.tallapoosariverpottery.com/
| |
|
