Alisa Clausen on thu 22 apr 04
and colorarants
Glaze test for Cal Cushing cone 5/6 Barium Stone Mat, oxidation.
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:
60 Neph. Syenite
24 Barium Carb.
5 Lithium Carb.
6 EPK Kaolin
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: =20
All of the tests appear under fired. The test with Manganese has a =
slightly better melt and the test with Chrome has a bubbled and dry =
surface.
Base
Mat, milky glaze. Oxides are visible but slightly muted.
3 Copper Carb.
Mat, strong turquoise in color. Smooth. Thick to thin application shows =
a visible difference.
=20
1 Chrome Ox.
Under fired. Bright yellow color with a slight light green cast.
0.5 Manganese Diox.
Mat, purplish with specs. Smooth and appears melted.
Regards from Alisa in Denmark
| |
|
