Alisa Liskin Clausen on sat 16 nov 02
Glaze test for oxides under Chappel's Semi Gloss, cone 5, ox. =20
Glaze tested on white midrange stoneware fired in electric oxidation to =
1220c.
Source: John Hesselberths's website www.frogpondpottery.com
(reintroduced to me by Charles Moore)
Credited to:
Firing ramp:
100c p/h to 600c (212f - 1112f)
150c p/h to 1100c (330f - 2012f)=20
100c p/h to 1220c (212f - 2228f)
cool down max. per hour to 1100c=20
cool 80c per hour to 800c
shut off kiln
Recipe:
45.7 Kona F-4 feldspar
15.2 Silica
12.7 Talc
12.9 Gerstely Borate
9.0 Dolomite
4.5 EPK
1.0 Bentonite
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.
Substitutions:
Forsahmmer Feldspar for Kona F-4
Results:
Clear semimatte glaze with a satin feel. Like Charles description, it =
looks like vellum. Turned slightly yellow on my clay body.
All oxides, Cobalt, RIO, black stain, Chrome and Ochre, showed straight =
edges as painted. However, glaze covered the oxides enough to let the =
painting show through, but the colors were virtually indistinguishable =
from each other. Otherwise a well covering, good feel, semimatte glaze.
Regards from Alisa in Denmark
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