Alisa Liskin Clausen on thu 13 jun 02
Glaze test for Stonyearth Green, fired cone 6 ox.
Glaze tested on white midrange stoneware fired in electric oxidation to =
1220c.
Source: Clayart
Credited to: Richard Behrens
Firing ramp:
100c p/h to 600c (212f - 1112f)
150c p/h to 1100c (330f - 2012f)=20
100c p/h to 1220c (212f - 2228f)
cool down max. per hour to 900c (1652f)
hold for one hour at 900c
shut off kiln
Recipe:
8.40 Bone Ash
18.70 Neph. Sye.
2 Magnesium Carb.
8.90 Wollastonite
11.80 Earth
32.50 Strontium Carbonate
15.30 Eng. Kaolin CC31
2.50 Silica
ADD
5.60 Tin Oxide
3.00 Copper ox.
Note: All raw materials are measured up or down to the nearest whole =
decimal. =20
Colorants or additives to a 100 gram test batch are measured in precent =
to the 100 gram test batch.
Substitutions:
Oldenwalder clay for Earth
Kaolin for Eng. Kaolin CC31
Results:
Medium brown matte glaze with slightly puple cast. Very smooth surface. =
No signs of green. Will retest much thicker to see if greens show up.
Regards from Alisa in Denmark
Ababi on thu 13 jun 02
Credited to: Richard Behrens and ABABI! (for the Earth variation)
Hello Alisa
The next time you make it, take soil from the garden dry it in the
kiln, sieve it with a kitchen sieve as thin as possible.
I send here two recipes
the second
the original
The third with earth -You sent already.
ONE
==============
STONY WHITE-BEHRENS
like the second without the copper
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 11.12%
MgO 0.073 1.70%
SrO 0.458 27.30%
Al2O3 0.247 14.49%
P2O5 0.042 3.40%
SiO2 1.064 36.83%
TiO2 0.000 0.02%
K2O 0.037 2.00%
Na2O 0.088 3.14%
Al:Si 4.31
Expan. 9.4
Because I do not have right analysis of my soil, the glaze melts more
than it should according to Rhodes's analysis of average soil.
It gives surprising rough result.
I think, Alisa, that you missed the point of taking a ready to use clay.
The right way is to take soil from your garden, badly sieved makes the
glaze different than the
regular ones. The good thing I can tell you: Using clay you added more
alumina and silica to the glaze and made it probably more stable
Ababi Sharon
Kibbutz Shoval- Israel
Glaze addict
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910/
http://www.milkywayceramics.com/cgallery/asharon.htm
---------- Original Message ----------
>Glaze test for Stonyearth Green, fired cone 6 ox.
>Glaze tested on white midrange stoneware fired in electric oxidation
to
>1220c.
>Source: Clayart
>Credited to: Richard Behrens and ABABI! (for the Earth veriation)
>Firing ramp:
>100c p/h to 600c (212f - 1112f)
>150c p/h to 1100c (330f - 2012f)
>100c p/h to 1220c (212f - 2228f)
>cool down max. per hour to 900c (1652f)
>hold for one hour at 900c
>shut off kiln
>Recipe:
>8.40 Bone Ash
>18.70 Neph. Sye.
>2 Magnesium Carb.
>8.90 Wollastonite
>11.80 Earth
>32.50 Strontium Carbonate
>15.30 Eng. Kaolin CC31
>2.50 Silica
>ADD
>5.60 Tin Oxide
>3.00 Copper ox.
>Note: All raw materials are measured up or down to the nearest whole
>decimal.
>Colorants or additives to a 100 gram test batch are measured in
precent
>to the 100 gram test batch.
>Substitutions:
>Oldenwalder clay for Earth
>Kaolin for Eng. Kaolin CC31
>Results:
>Medium brown matte glaze with slightly puple cast. Very smooth
>surface. No signs of green. Will retest much thicker to see if
greens
>show up.
>Regards from Alisa in Denmark
>_______________________________________________________________________
_
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>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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