Ababi on mon 30 apr 01
New glazes
*************************
The point here was
1)To try and do something with the cadycal I bought from Axner
To make a substitute to the 80/20, With a lot of materials that are or
behave like clay, in the point of suspension-able (is it a word? You don'=
t
have frit 2120 but without any B2O3 for red clay you take redart.
What you really have to do, is to take the basic recipe of 80/20 through =
a
glaze software and while converting the materials try to use the "clay li=
ke"
materials as I wrote, includes wood ash.
Raku 80/20with a lot of clay
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D
RED CLAY............ 1.7 1.69%
BALL CLAY (AK)...... 14.0 13.99%
MAGNESIUM CARBONATE. 5.6 5.64%
CADYCAL 100......... 47.5 47.49%
FRIT 2120........... 25.2 25.17%
WHITING............. 6.0 6.02%
=3D=3D=3D=3D=3D=3D=3D=3D
100.0
CaO 0.621*21.092%
MgO 0.146* 3.556%
K2O 0.003* 0.162%
Na2O 0.230* 8.619%
SrO 0.000* 0.015%
TiO2 0.001 0.039%
Al2O3 0.115 7.072%
B2O3 0.679 28.588%
SiO2 0.837 30.438%
Fe2O3 0.004 0.418%
Text133.601
Si:Al 7.304
SiB:Al13.229
Expan 9.060
The Cadycal is very similar in structure to Colemanite but does not fly
around.
Result
=3D=3D=3D=3D=3D=3D=3D=3D=3D
When 'gloss', dark gray with nice crackles very shiny, probably from the
B2O3
around 980C (?) when the cone, 06 starts to bend; White, nicer crackles.=
It
is
about the and of the gas, I do not know if it has to do anything except t=
he
long firing.
Here is the original recipe of Egyptian Raku from Dewitt Gimblet:
Egyptian Blue Raku
Egyptian Raku
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
SODA ASH............ 29.47 29.47%
LITHIUM CARBONATE... 8.21 8.21%
ENGLISH KAOLIN(Puraf 21.74 21.74%
QUARTZ.............. 37.20 37.20%
COPPER OXIDE........ 2.42 2.42%
BENTONITE........... 0.97 0.97%
=3D=3D=3D=3D=3D=3D=3D=3D
100.01
CaO 0.00* 0.01%
Li2O 0.50* 4.99%
MgO 0.00* 0.03%
K2O 0.03* 1.01%
Na2O 0.46* 9.55%
TiO2 0.00 0.03%
Al2O3 0.35 11.88%
SiO2 3.60 72.19%
Fe2O3 0.01 0.31%
Text1 10.57
Si:Al 10.31
SiB:Al 10.31
Expan 7.69
Too much alumina for ^06
I changed the recipe using frit 2120 and reduced the kaolin to have 0.2 m=
ol
alumina. My good adviser Yehuda, said I should not remove the Soda ash as=
it
has it's own part in the "game"migrating to the surface.
In this glaze I play the miser; In order to by books and pay for them mos=
tly
to U.S. post office, I try to add ash wherever I can, to save frits.
Nothing to copy, just the idea, The result was more like ash glaze than r=
aku
glaze, at list it matured in regular raku "gloss".
Raku ash glaze
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
PINE ASH............ 20.00 20.00%
FRIT 6004........... 70.00 70.00%
RED CLAY............ 10.00 10.00%
=3D=3D=3D=3D=3D=3D=3D=3D
100.00
CaO 0.09 5.08%w 6.17%m
MgO 0.03 1.39%w 2.36%m
K2O 0.18 16.83%w 12.19%m
Na2O 0.16 9.89%w 10.88%m
TiO2 0.00 0.11%w 0.09%m
Al2O3 0.04 4.63%w 3.09%m
B2O3 0.26 18.03%w 17.67%m
P2O5 0.01 1.80%w 0.86%m
SiO2 0.65 39.60%w 44.94%m
Fe2O3 0.01 1.51%w 0.65%m
MnO 0.02 1.13%w 1.09%m
Text1 12.54
Si:Al 14.53
SiB:Al 20.24
Expan 12.68
This one based on some glazes, the original of Yehuda Koren is
frit 6004 ....70
wolostonite...30
I broke the wolastonite. Again unless you buy your materials from my
supplier, it is only the idea I pass here.
RAKU EFFECT (REFECT)
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D
FRIT 6004........... 70.00 70.00%
BONE ASH............ 15.00 15.00%
QUARTZ.............. 15.00 15.00%
=3D=3D=3D=3D=3D=3D=3D=3D
100.00
CaO 0.14 8.13%w 9.78%m
K2O 0.12 10.85%w 7.78%m
Na2O 0.13 8.05%w 8.77%m
Al2O3 0.02 2.45%w 1.62%m
B2O3 0.26 17.85%w 17.32%m
P2O5 0.05 6.87%w 3.27%m
SiO2 0.76 45.80%w 51.46%m
Text1 16.07
Si:Al 31.74
SiB:Al 42.42
Expan 10.22
+4 copper oxide
+1 RIO I bought the synthetic RIO from Steve Mills, more reason to use as=
h
in glazes!
Thin, red and gold, medium orange peel and thick crater ( like the soil i=
n
the
desert)
Ababi Sharon
ababisha@shoval.ardom.co.il
http://members4.clubphoto.com/ababi306910/
http://www.milkywayceramics.com/cgallery/asharon.htm
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