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

updated fri 23 apr 04

 

Alisa Clausen on thu 22 apr 04

with colorants

Glaze test for Val Cushing Smooth Satin/Mat Glaze, cone 5/6 ox.

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:
45 Neph. Syenite
18 Whiting
20 EPK
12 Zinc Oxide
5 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:

Base
Glossy, transparent base, crazed badly. Oxides did not move under =
glaze.

10 Zircopax
Glossy, white glaze, crazed. Oxides did not move under base.

2 Cobalt Carb.
Glossy, dark blue glaze. No visible crazing.

1 Cobalt Carb, 2 Chrome
Slightly less glossy, dark green glaze. No visible crazing.

1 Copper Carb.
Very glossy, transparent glaze, light green. Crazed.

10 Ochre
Slightly less glossy, ochre brown glaze. Slight crazing.

10 RIO
Slightly less glossy, dark brown glaze. No visible crazing.


Regards from Alisa in Denmark

Steve Slatin on thu 22 apr 04

with colorants

Alisa --

I cannot tell you enough how valuable these tests are.

Being able to see your results and have the firing details makes it much easier to
understand the range of results you got. Thanks, and best wishes.





-- Steve Slatin -- Entry-level potter, journeyman loafer, master obfuscator
No website, no sales room, no scheduled hours
All talk, no action
Sequim, Washington, USA
48.0937N, 123.1465W or thereabouts

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