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glaze test for some bright green glaze, cone 6,

updated fri 4 feb 05


Alisa Clausen on thu 3 feb 05

Clay Times May/June 2004

Glaze test for Some Bright Green Glaze, cone 6, Clay Times May/June 2004 =

Glaze tested on white midrange stoneware fired in electric oxidation to =
1240c. (2264f)

Source: Clay Times, May/June 2004
Credited to: Julia Galloway

Firing ramp:
100c p/h to 600c (212f - 1112f)
150c p/h to 1140c (302f - 2084f)=20
80c p/h to 1240c (176f - 2264f)
5 min. soak
cool down max. to 800c (1472f)
Hold 1 hour
Shut off kiln


40.91 Custer Feldspar
31 82 Strontium Carb.
11.82 Ball Clay
9.09 Zinc Oxide
6.36 Whiting

Results with added oxides:

3 Cobalt Carb:
resulted in a stony mat glaze, deep dark blue. Iron specs in clay body =
show through as spread out rust spots,=20
this otherwise covering glaze.

or 2 Rutile
Stony mat glaze, white with a yellow cast where thinner. Iron specs in =
clay showed through.

or 1-3 RIO
Stony mat glaze, dark caramel rust color.

or 3 Cu Carb.
Stony mat, bright copper green, with darker olive green where thickest.

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.

Regards from Alisa in Denmark

or 1-3 RIO