Alisa Clausen on fri 28 may 04
and Strontium sub.
Glaze test for Em. Cooper Nickel Blue Glaze, 1200c, oxidation
Glaze tested on white midrange stoneware fired in electric oxidation to =
1220c.
Source: Hamer and Hamer
Credited to: Emmanuel Cooper
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
Recipe:
52 Feldspar used Feldshammer Spar
5 Whiting
15 Barium Carbonate Hazard
12 Zinc Oxide
6 China Clay
10 Silica
ADD
2 Nickel Oxide Hazard
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.
Results:
A semi mat yellow to light brown glaze, with bright blue specs. =20
results with
11.2 gm. Strontium Carbonate subbed for 15 gm. Barium:
The glaze is similar to the above, but the ground color is paler than =
the Barium version. Blue specs are as visible.
Regards from Alisa in Denmark
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