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glaze test for red orange, mike baily, cone 6, oxidation

updated wed 8 jun 05


Alisa Clausen on tue 7 jun 05

Glaze test for Red Orange, Mike Baily, cone 6, oxidation tested on white =
midrange stoneware fired in electric oxidation to 1220c. (2228f)

Credited to:

Firing ramp:
100c p/h to 600c (212f - 1112f)
150c p/h to 1140c (302f - 2084f)=20
80c p/h to 1220c (176f - 2228f)
15 min. soak
cool down max. to 1100c (2012f)
Hold 1 hour
Shut off kiln

46.7 Potash
2 Bentonite
15 Bone Ash synthetic
4 Lithium Carb.
16.9 Talc
11.4 Flint

11.5 Red Iron Oxide

Note: All raw materials are measured up or down to the nearest half =
decimal. =20
Colorants or additives to a 100 gram test batch are measured in percent =
to the 100 gram test batch.

Semi gloss, satin smooth surface, dark brown. As described in Clay =
Times, an unfortunate "depressing Yuck Brown".
However, the surface is so attractive, and in strong light, there is an =
orange spec. This is a glaze I will further test, like
in the Clay Times article by Lana Wilson and Kate Magruder, to develop =
the color. The surface is appealing but my test results of color need =
I found from my glaze work with red clay glazes, the difference of a =
flux or spar can make vast variations in surface color.

tested 11.5 Crocus Martis instead of RIO
Same silk mat surface, covering glaze. Color is a green brown where =
thickest and brown where thinnest.

Regards from Alisa in Denmark