Alisa Liskin Clausen on mon 12 aug 02
The following is a list of a simple and trustworthy raku crackle, gloss =
glazes.
2000 is reasonable to mix and good to work with.
100 Borax frit
20 Ball clay
ADD FOR
Dark blue green
2 Cobalt oxide
2 Copper oxide
5 Red Iron Oxide
Turquoise
3 Copper oxide
3 Tin oxide
Copper Flashing on green/blue ground
12 Copper oxide
4 Tin oxide
White=20
15 Zircopax
SLIPS 500-1000 g reasonable to mix and easy to use. I =
use these slips on my cone 6 stoneware as well with different results in =
oxidation.
100 Ball Clay
ADD FOR
Light Blue
1 Cobalt oxide
2 Copper oxide
Blue
1 Cobalt oxide
2 Copper oxide
5 Tin oxide
Dark Blue
3 Cobalt oxide
Light Turquoise
4 Copper oxide
3 Tin oxide
Yellow/green
2 Chrome oxide
Light Green
2 Chrome oxide
1 Cobalt oxide
Orange/green
33 red clay
2 Copper oxide
Dark bluegreen
2 Cobalt oxide
2 Copper oxide
4 Red Iron Oxide
Light Orange
50 Red Clay
Orange
100 Red Clay =20
Decoration
Using a white raku body, bisque the ware.
Paint a design with wax resist, i.e. fish, patterns, your imagination.
Dip or paint ware in slip, outside only
Remove any slip that is sticking to waxed areas.
Dip in well stirred glaze, inside and outside
After firing, pot will have a blackened raw clay area where wax has =
melted to reveal your design. The clear crackle will reveal the color =
of
your slip outside and inside you will have a milky clear crackle. Nice =
contrasts.
Good luck and regards from
Alisa in Denmark
Ababi on tue 13 aug 02
Hello Alisa
This recipe might mislead.
My teacher after a workshop with David Jones came to class excited and said : A new
recipe 85 frit and 15 kaolin, I belive it is like yours Alisa.
David Jones did not know that the main sold frit in Israel has 0.1 mol of alumina. I think
He might of think of BPS soft borax frit with 0.01 mol alumina the higher is the alumina
the glaze will mature in a higher cone. When you raku and try to get your ware ready in
950-1000C ^08-^06 you must know what you use. Borax frit can be 3195 or 3134 yet
there are differences.
We need the lowest alumina possible frit that allows us to use more kaolin and save
our CMC for other uses.
Here is the analysis of:
Soft borax frit Bath 100.00 100.00%
========
100.00
CaO 0.25* 4.80%
MgO 0.01* 0.10%
K2O 0.01* 0.19%
Na2O 0.73* 15.30%
Al2O3 0.01 0.31%
B2O3 1.33 31.20%
SiO2 2.38 48.11%
Si:Al263.89
SiB:Al411.67
Expan 9.37
The way I have it in Insight
This frit has two disadvantages
1) the high cost at the shop.
2) As having above 30% B2O3 it crystallize after a while
The rest is advantage!
About ball clay: In my different tests the ball clay ( AK) caused tiny crackles that
caused gray look to the glazes. Because of this reason I used only kaolin.
Ababi Sharon
Glaze addict
Kibbutz Shoval Israel
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910/
http://www.milkywayceramics.com/cgallery/asharon.htm
---------- Original Message ----------
>The following is a list of a simple and trustworthy raku crackle, gloss glazes.
>2000 is reasonable to mix and good to work with.
>100 Borax frit
> 20 Ball clay
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