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
Recipe:
40 Custer Spar
9 Frit 3134
16 Whiting
9 Talc
10 EPK
16 Flint
ADD
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.
Results:
Gloss, slightly variegated, medium denim blue glaze with slight green =
cast. Covering.
Where thickest, glaze is a semi mat and greener in color.
Variations:
Base recipe
+Cobalt
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.
+Cobalt
+Titanium Diox.
Gloss, medium blue glaze. Color is the brightest blue of three tests.
Regards from Alisa in Denmark
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