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glaze test for v.c. denim blue, cone 6 oxidation.

updated wed 8 jun 05


Alisa Clausen on tue 7 jun 05

Glaze test for V.C. Denim Blue, cone 6, oxidation.

Glaze tested on white midrange stoneware fired in electric oxidation to =
1220c. (2228f)

Source: Clay -Times, March/April 2005
Credited to: Val Cushing

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

40 Custer Spar
9 Frit 3134
16 Whiting
9 Talc
10 EPK
16 Flint

1.2 Cobalt Carb.
1.2 Copper Carb.
2.0 Titanium Diox.

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.

Gloss, slightly variegated, medium denim blue glaze with slight green =
cast. Covering.
Where thickest, glaze is a semi mat and greener in color.

Base recipe
No Copper Carb.
No Titanium Dioxide
Slightly less glossy, a semi gloss, smooth glaze. A purple blue, with =
some lilac on the thicker areas. No green.

Base recipe=20
No Copper Carb.
+Titanium Diox.
Gloss, medium blue glaze. Color is the brightest blue of three tests.

Regards from Alisa in Denmark