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glaze test for lana's purple, ^6 ox.

updated thu 28 feb 08


Alisa Clausen on wed 27 feb 08

Glaze test for Lana's Purple

Source: Clayart

Credited to: Lana Wilson

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: Lana Purple nr. 1
Cone: 6 Color:
Firing: Oxidation Surface: Semimatte
Amount Ingredient
37 Feldspar--Custer
12 Frit--Ferro 3124
6 Dolomite
14 Talc
23 Silica
92 Total
3 Zinc Oxide
3 Cobalt Carbonate
2 Bentonite
Unity Oxide
.106 Na2O
.138 K2O
.46 MgO
.296 CaO
1.000 Total
.255 Al2O3
.08 B2O3
.002 Fe2O3
3.57 SiO2
14 Ratio
6.4 Exp

Semimatte, covering glaze. Overall Magnesium violet in color. Some
pinholing where very thick.

Purple nr. 2 has a nicer surface, smoother, brighter