Alisa Clausen on mon 21 feb 05
Glaze test for AC Dark Grey Semi Mat Glaze and variations, cone 6 =
oxidations.
Glaze tested on white midrange stoneware fired in electric oxidation to =
1240c. (2264f)
Source:
Credited to: Alisa Clausen
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
Recipe:
20 Oldenwalder
20 Dolomite
20 Feldspar
20 Frit J try 3134
20 Silica
ADD
2 Cobalt Carb.
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.
Results:
A semi mat, dark gray glaze that is covering and smooth.
Recipe plus 5 Rutile
A semi mat glaze that is a bluer gray than the original. The surface =
has crystals, giving the surface a slight sparkle.
Original recipe minus Cobalt Carb.
A semi mat glaze that is cream in color with a yellow cast. It also has =
crystals on the surface, giving the surface a
slight sparkle. Where it pools, it is glassy.
Original recipe minus Cobalt Carb., plus 5 Rutile
Gloss glaze under a cream, streaked shell. Blue opalescent areas where =
thickest. Breaks clear.=20
Regards from Alisa in Denmark
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