Alisa Liskin Clausen on sun 8 sep 02
Glaze test for Brown Persimmon, cone 6 radix, fired to cone 6 ox.
Glaze tested on white midrange stoneware fired in electric oxidation to =
1220c.
Source: Clayart
Credited to:
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 1100c=20
cool 80c per hour to 800c
shut off kiln
Recipe:
37.63 Silica
21.51 Neph. Syenite
16.13 Whiting
13.98 EPK
10.75 Gerstely Borate
ADD
16.13 RIO
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 percent =
to the 100 gram test batch.
Substitutions:
Borax frit for Gerstely Borate
Results:
Reddish brown covering gloss glaze. Dark and even in color, very smooth =
feel. More brown than red, a brown gloss with a rust tinge. =20
Glaze was applied thickly in areas and did not move. Very even melt and =
color is very rich and warm. One of the nicest I have tested in the =
persimmon families.
Regards from Alisa in Denmark
Ron Roy on sat 14 sep 02
This looks like it could be a stable glaze - expansion is a bit high so I
have lowered it a bit using MgO and also used frit 3134 instead of GB. It
has a low expansion without the iron so test it for fit if you use it that
way.
Neph Sy - 11.0
Whiting - 5.0
3134 Frit - 21.0
Talc - 11.0
EPK - 25.0
Silica - 29.0
Red Iron - 16.0
Total 115.0
RR
>Glaze test for Brown Persimmon, cone 6 radix, fired to cone 6 ox.
>Glaze tested on white midrange stoneware fired in electric oxidation to 1220c.
>Source: Clayart
>Credited to:
>
>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 1100c
>cool 80c per hour to 800c
>shut off kiln
>
>Recipe:
>37.63 Silica
>21.51 Neph. Syenite
>16.13 Whiting
>13.98 EPK
>10.75 Gerstely Borate
>
>ADD
>16.13 RIO
>Substitutions:
>Borax frit for Gerstely Borate
>
>Results:
>Reddish brown covering gloss glaze. Dark and even in color, very smooth
>feel. More brown than red, a brown gloss with a rust tinge.
>Glaze was applied thickly in areas and did not move. Very even melt and
>color is very rich and warm. One of the nicest I have tested in the
>persimmon families.
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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