Alisa Liskin Clausen on sat 16 nov 02
Glaze test for oxides under Buttery Cream Satin Matte, cone 6, ox.
Glaze tested on white midrange stoneware fired in electric oxidation to =
1220c.
Source: John Hesselberth's website www.frogpondpottery.com
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:
21 Dolomite
10 Gerstely Borate
9 Spodumene
5 Wollastonite
27 Custerspar
12 Neph. Syenite
16 Kaolin
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:
Forshammer spar for Custer
Results:
True to it's name white satin matte glaze. Some areas with narrow =
rivulets of compact, tight crystals. Oxides Cobalt, RIO, black stain, =
Chrome and Ocher showed well but muted under the glaze, with mostly =
diffused edges. The Chrome is a dark tan.
Same glaze test made with local frit subbed for Gerstely Borate with =
similar results. This test showed a very similar glaze and oxide =
effect, however glaze is slightly glossier than the recipe with Gerstely =
Borate.
Regards from Alisa in Denmark
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