Alisa Clausen on thu 22 apr 04
oxidation and colorants
Glaze test for Val Cushing cone 5/6 Stone mat, whitish base, oxidation =
and colorants
Glaze tested on white midrange stoneware fired in electric oxidation to =
1220c.
Source: Ababi
Credited to: Val Cushing
Firing ramp:
100c p/h to 600c (212f - 1112f)
150c p/h to 1100c (330f - 2012f)=20
100c p/h to 1220c (212f - 2228f)
5 min. soak
cool down max. to 800c
Hold 1 hour
Shut off kiln
Recipe:
50 Neph. Syenite
10 Barium Carb.
5 Frit 3134 subbed Frit J
5 Lithium Carb.
10 EPK Kaolin
15 Silica
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.
Results:
Glazes appear slightly under fired. . Can see higher areas of thicker =
glaze, for example, where it dripped. Not melted in.
Tile with Copper and the one with RIO have a better melt.
Base
Mat, milky base. Oxides are visible but slightly muted by covering =
glaze.
3.0 Copper Carb.
Mat, light green glaze with slightly darker areas where thinner.
3.0 RIO
Mat, yellow glaze.
3.0 Chrome
Mat, dark green glaze, brown where thinner. Appears under fired.
Regards from Alisa in Denmark
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