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glaze test for alred white, cone 6 oxidation

updated mon 3 nov 03


Alisa Clausen on sun 2 nov 03

Glaze test for Alfred White, cone 6 oxidation

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

Source: Clayart, Hal Whinnie
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)
5 min. soak
cool down max. to 800c
Hold 1 hour
Shut off kiln

46.7 F4 Feldspar
15.3 Silica
13.7 Talc
11.6 Colemanite
8 Dolomite
4.5 EPK

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 precent =
to the 100 gram test batch.

Gerstely Borate for Colemanite, gram for gram.

The glaze remained very high on the test tile, as to say, melted but not =
mature. It is thick and white, with areas of separation in the surface, =
where the glaze began to melt, but not enough to smooth out. Overall =
soft white color.
Same glaze tested with local borax Frit 623 subbed for Colemanite, =
showed a similar glaze result.

Regards from Alisa in Denmark