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glaze test for bristol glaze, heloise, cone 6, oxidation

updated fri 4 feb 05


Alisa Clausen on thu 3 feb 05

Glaze test for Bristol Glaze, Heloise, cone 6, oxidation

Glaze tested on white midrange stoneware fired in electric oxidation to =
1240c. (2264f)

Source: Clayart
Credited to: Heloise

Firing ramp:
100c p/h to 600c (212f - 1112f)
150c p/h to 1140c (302f - 2084f)=20
80c p/h to 1240c (176f - 2264f)
5 min. soak
cool down max. to 800c (1472f)
Hold 1 hour
Shut off kiln

68 Feldspar Potash
10 Calcium Carb.
7 Zinc Oxide
8 Kaolin
7 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.

Used Whiting as source for Calcium Carb.

A semi mat glaze, glossier than Janet Hamer's Bristol Glaze recipe. =
White, but not completely opaque, allowing for
oxides to show through.

Regards from Alisa in Denmark