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 =
1220c.
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
Recipe:
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.
Substitutions:
Gerstely Borate for Colemanite, gram for gram.
Results:
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
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