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glaze test for val cushing cone 5/6 satin mat, smooth whitish,

updated fri 23 apr 04


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 =

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

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.

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 =

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 =

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