Alisa Clausen on thu 22 apr 04
oxidation.
Glaze test for Val Cushing cone 4/5/6 Leadless, Glossy, Transparent, =
oxidation.
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:
35 Kona F-4 Feldspar subbed Feldshammer Feldspar (mix of =
potash and soda)
28 Gerstely Borate
8 Barium Carb.
8 Whiting =20
8 EPK Kaolin
18 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:
Base
Transparent gloss, oxides did not move under glaze.
1.0 Copper Carb.
Transparent gloss light blue/green glaze.
Regards from Alisa in Denmark
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