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glaze test for brian kemp lichen glaze, cone 6 ox.

updated tue 22 feb 05


Alisa Clausen on mon 21 feb 05

Glaze test for Brian Kemp Lichen Glaze, cone 6 ox.

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

Source: Clay Times, Nov/Dec, 2001, Bacia Edelman
Credited to: Brian Kemp

Firing ramp:
100c p/h to 600c (212f - 1112f)
150c p/h to 1140c (302f - 2084f)=20
80c p/h to 1240c (176f - 2264f)
10 min. soak
cool down max. to 1100c (2012f)
Hold 1 hour
Shut off kiln

30 Soda Spar
30 Talc
10 3132
10 Talc
20 Kaolin

Note: All raw materials are measured up or down to the nearest half =
decimal. =20
Colorants or additives to a 100 gram test batch are measured in percent =
to the 100 gram test batch.


Application is crucial. The glaze needs to be applied thickly enough =
that it forms thin cracks over the dried surface.
The glaze by itself formed very small, closely placed curdles, slightly =
glossy and slightly craggy borders. The shapes are
irregular and are raised from the clays surface, but not high. They are =
distinct curdles and have a slightly rough feel, but not

With 3% Rutile added
Looks and feels similar to the above. Has a slightly tan cast and the =
curdles are slightly, slightly larger.

Over Commercial 04 Black glaze
The glaze formed larger curdles that are have smoother, although =
irregular, borders. Their overall feel is smoother than the glaze =
The black glaze pooled around the base of the curdles, forming black =
boarders. The spaces in between the curdles is a transparent iron =

Over Lili Krakowski's Albany Slip Substitute
The glaze retains it's original characteristics of raised, irregularly =
shaped curdles, small and tightly spaced. The underlying slip pools =
slightly around the base of the individual curdles, giving a darker =
base. The space in between the curdles is honey brown. Overall =
smoother to the touch than the glaze by itself.

Regards from Alisa in Denmark