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glaze test for opal blue, cone 6 oxidation

updated sat 29 may 04


Alisa Clausen on fri 28 may 04

Glaze test for Opal Blue, cone 6 oxidation.

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

Source: Clayart
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

50 Frit 3134 used Frit J
25 Kaolin
25 Silica

1 Cobalt used 1.5 Carbonate
4 Rutile

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.

A glossy opalescent green glaze, with opaque patches and rivulets of =
periwinkle blue where thickest. This glaze did not run, and has surface =
with many nuances. Please note that Ron Roy suspects that this glaze =
could break down in the dishwasher, due to it's low Alumina.
Regards from Alisa in Denmark