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glaze test for mark bell's lichen glaze, cone 6 ox.

updated tue 22 feb 05


Alisa Clausen on mon 21 feb 05

Glaze test for Mark Bell's Lichen Glaze, cone 6 ox.
Glaze tested on white midrange stoneware fired in electric oxidation to =
1240c. (2264f)

Credited to: Mark Bell

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
31 Magnesium Carb.
6 Frit 25
8 Talc
6 Zinc Oxide
10 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.

The application of this glaze is crucial. It must be applied thickly =
enough that it dries with slight cracks over the dried surface.

This recipe is very similar to Brian Kemp's recipe, with the addition of =
Zinc Oxide.=20
The glaze forms small, close, irregularly shaped curdles. They are have =
a more mat surface than the Kemp recipe. The addition=20
of Zinc also makes the overall glaze slightly drier and the edges of the =
curdles are slightly lifted. The overall feel is craggy and rough.
It resembles lichen moss and although the edges are lifted, they are =

With 3% added Rutile
Same as above, but slightly larger lichen forms, color is also the same.

Over Commercial Black cone 04 glaze
the curdles smoothed out, are in general larger and glossier. The Black =
glaze pools in between the curdles.

Regards from Alisa in Denmark