Alisa Clausen on thu 22 apr 04
oxidation, with colorants
Glaze test for Val Cushing cone 5/6 Satin Mat, Smooth Whitish, =
oxidation, with colorants.
Glaze tested on white midrange stoneware fired in electric oxidation to =
1220c.
Source: Ababi
Credited to: Val Cushing
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:
25 Neph. Syenite
25 Frit 3134 subbed Boron Frit J
20 Whiting
15 EPK
15 Silica
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:
All of these tiles have a smooth, silky texture and a good mat surface, =
without being dry. All oxides tested in base resulted in a speckled =
surface.
Base
Semi mat, smooth, whitish base, oxides did not move. Oxides showed =
through and did not move.
10 Zircon
Semi mat, smooth white base, oxides showed through and did not move.=20
2 Cobalt Carb.
Semi mat, smooth deep blue with lighter flecks.
1 Cobalt Carb., 2 Chrome
Semi mat dark green with light blue flecks. Reversed where thinner.
1 Copper Carb.
Semi mat olive green/brown with light green flecks. Reversed where =
thinner.
10 Ochre
Semi mat yellow ochre. Test tile should have been thicker
.
10 RIO
Semi mat deep ochre brown with lighter flecks.
Regards from Alisa in Denmark
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