Alisa Clausen on wed 27 feb 08
Glaze test for Lana's Purple # 2, ^6 ox.
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. 2
Cone: 6 Color:
Firing: Oxidation Surface: Semimatte
Amount Ingredient
27.2 Feldspar--Custer
8.2 Frit--Ferro 3134
31.8 Silica
2 Bentonite
11.7 Whiting
14 Nepheline Syenite
3.5 Lithium Carbonate
1.6 Magnesium Carbonate
100 Total
Additives
.6 Cobalt Carbonate
4.8 Tin Oxide
.2 Chromium Oxide
Unity Oxide
.155 Li2O
.165 Na2O
.12 K2O
.07 MgO
.49 CaO
1.000 Total
.272 Al2O3
.09 B2O3
.003 Fe2O3
3.529 SiO2
13 Ratio
7.1 Exp
Comments:
Semimatte , smooth purple to reddish mauve glaze.
Smooth surface
subbed 8.2 G.B. with Frit 3134
Cannot be accurate with the oxide measurements on gram scale. Cut one gram
of oxide to ca. half and quarter to measure oxides.
Subbed the Lithium with Strontium. Same color but surface showed brush
strokes, a little stiffer.
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