Alisa Clausen on wed 2 may 07
Ox. fired to Cone 6 Ox.
Glaze test for Lana's Purple Aqua Glaze, Cone 06, fired to Cone 6, Ox.
Source: Ceramic Arts Buyer's Guide, 2007
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.
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.
45 Barium Carbonate
45 Nepheline Syenite
4 Frit--Ferro 3124
5 Copper Carbonate
Results at Cone 6
Mat, smooth and covering glaze. Color ranges from a deep and bright blue
where thickest to a turquoise where thinner.
Why fire this glaze so high? Because I wanted to see if in Glaze Chemistry
theory, a glaze made up a glaze core, Nepheline Syenite and anAlkaline Earth
Flux, Barium Carb., and no Boron, could fire higher and not run off the
test. It succeeded. It seems that this combination could be fired
even higher. At 1220c feels and looks mature.
Best regards from Alisa in Demark.