Alisa Clausen on wed 2 may 07
Glaze test for Cooper Mottled White, Cone 6, Ox.
Source: Lili Krakowski
Credited to: Cooper
Fired on mid fire white stoneware
Firing ramp with an electric controller is:
100c p/h to 600c (212f - 1112f)
150c p/h to 1140c (302f - 2084f)
80c p/h to 1220c (176f - 2228f)
15 min. soak
cool down max. to 900c (1652f)
Hold 30 minutes
Shut off kiln
Colorants or additives to a 100 gram batch are measured in percent to the
100 gram batch.
Substitutions in this test: Frit 3134 subbed with local Boron Frit,
Feldspar used is Forshammer, Boron Frit is subbed for Gerstley Borate. All
substitutions are done not by Mol. Wts., but gram for gram.
Amount Ingredient
40 Feldspar--Custer
5 Whiting
40 Dolomite
10 Ball Clay--Old Mine #4
5 Silica
100 Total
Unity Oxide
.037 Na2O
.081 K2O
.378 MgO
.503 CaO
1.000 Total
.177 Al2O3
.004 Fe2O3
1.172 SiO2
.003 TiO2
6.6 Ratio
8.2 Exp
Results:
Semi Mat, smooth surface, white glaze. Glaze is whiter than the average
Dolomite white glaze, however, no mottling evident.
Best regards from Alisa in Denmark
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