Alisa Clausen on thu 3 feb 05
Glaze test for Purple Opal, cone 6 ox.
Glaze tested on white midrange stoneware fired in electric oxidation to =
1240c. (2264f)
Source: Clayart
Credited to:
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
Recipe:
14 Gerstely Borate
30 Spodumene
5 EPK
7 Dolomite
13 Talc
20 Silica
ADD
6 Rutile
1 Manganese Diox.
Underlying glaze is a mat tan. Over the mat tan ground is a streaky =
white and opalescent gloss shell. Overall, the glaze is tan with white, =
feathery streaking.
or
2 Cobalt Carb.
A dark blue purple mat glaze.
or
4-6 Copper Carb.
A semi mat glass green glaze.
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.
=20
Regards from Alisa in Denmark
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