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glaze test for leach clear, ^6 ox.

updated thu 28 feb 08


Alisa Clausen on wed 27 feb 08

Glaze test for Leach Clear ^6 ox

Source: Clayart
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.
Standard Substitutions in all tests:
Local Boron Frit is used for Frit 3134
Forshammer (a half and half Potash and Soda spar) is the only Feldspar used
Local Boron Frit is used for Gerstley Borate
All substitutions are done not by Mol. Wts., but gram for gram.

Recipe Name: Leach Clear
Cone: Color:
Firing: Oxidation Surface: Glossy
Amount Ingredient
25 Feldspar--Custer
25 Whiting
25 Silica
25 Kaolin--Calcined
15 Frit--Ferro 3124
115 Total

Unity Oxide
.084 Na2O
.082 K2O
.012 MgO
.823 CaO
1.000 Total
.478 Al2O3
.085 B2O3
.003 Fe2O3
3.077 SiO2
.001 TiO2
6.4 Ratio
7.1 Exp
Comments: Gloss, translucent glaze with tiny bubbles under the surface.