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glaze test for val cushing cone 5/6 alkaline mat, oxidation.

updated fri 23 apr 04


Alisa Clausen on thu 22 apr 04

Glaze test for Val Cushing cone 5/6 Alkaline Mat, oxidation.

Glaze tested on white midrange stoneware fired in electric oxidation to =

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

30 Neph. Syenite
25 Frit 3110 Subbed Boron Frit J
10 Whiting
10 EPK
10 Silica

Colorants or additives to a 100 gram test batch are measured in percent =
to the 100 gram test batch.

Results: =20
Glossy transparent base which crazed badly. Oxides became very fluid =
under glaze

1.0 Copper Carb.
Glossy transparent light green glaze, crazed and oxides became extremely =
fluid and runny under glaze.'

5.0 RIO
Glossy transparent light yellow glaze, crazed.

1.0 Manganese Diox.
Glossy transparent glaze, slightly purple. Crazed.

Regards from Alisa in Denmark