Alisa Clausen on thu 22 apr 04
oxidation and colorants
Glaze test for Val Cushing cone 5/6 Stone mat, whitish base, oxidation =
Glaze tested on white midrange stoneware fired in electric oxidation to =
Credited to: Val Cushing
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
50 Neph. Syenite
10 Barium Carb.
5 Frit 3134 subbed Frit J
5 Lithium Carb.
10 EPK Kaolin
Note: All raw materials are measured up or down to the nearest whole =
Colorants or additives to a 100 gram test batch are measured in percent =
to the 100 gram test batch.
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.
Mat, milky base. Oxides are visible but slightly muted by covering =
3.0 Copper Carb.
Mat, light green glaze with slightly darker areas where thinner.
Mat, yellow glaze.
Mat, dark green glaze, brown where thinner. Appears under fired.
Regards from Alisa in Denmark