Alisa Clausen on wed 2 may 07
Glaze test for Cooper 218, Cone 6, Oxidation
Source: Lili Krakowski
Credited to:
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
36 Feldspar--Custer
9 Whiting
22 Dolomite
5 Bentonite
28 Silica
100 Total
Additives
10 Rutile
Unity Oxide
.051 Na2O
.1 K2O
.3 MgO
.549 CaO
1.000 Total
.184 Al2O3
.006 Fe2O3
2.383 SiO2
12.9 Ratio
7.1 Exp
Results:
Semi mat, opaque glaze. Surface overall is a pale grey white, with a
mottled Rutile beige/pink blush throughout surface.
Best regards from Alisa in Denmark
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