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Currently I am researching translucent cone 10 porcelain. These two pieces were fired in an anagama kiln with minimal warping. (lit with a 3-cell D flashlight) |
I have years of testing in notebooks that will slowly be added to this section. Most dealing with slips, engobes, glazes, and clays. |
I have been studying the effects of fluxes on color development. I started with an old slipcasting recipe that I have modified and now retired: 55 Grolleg 20 Flint 25 Custer Feldspar with a pinch of Bentonite From this recipe I designed a base engobe for use in salt-firing: 50 Grolleg 20 Flint 30 Nepheline Syenite plus 5 Bentonite I have had very good luck spraying this engobe with wonderful results, but trailed lines would not always melt into the surface of the clay and didn't like sticking to the bisque which made me consider modifying the recipe by adding more flux. I started to consider the palette of color that can be achieved by substituting fluxes. Iron can produces almost the entire spectrum of color, but it requires changes in the types of flux. I developed a base unity formula that I altered by changing fluxes. |
I've tried to work out all the unity formulae out to fall near 1:1.3:6 which equates to 1 part flux, 1.3 parts stabilizer, and 6 parts glass formers. Now, I used a very simple program to calculate these batches (different programs will probably yield different results). A: Sodium Based Engobe (A3) 37 Grolleg 31 Nepheline Syenite 18 Silica 09 Soda Ash 05 Bentonite B: Potassium Based Engobe (B3) 30 Grolleg 50 Custer Feldspar 08 Pearl Ash 07 Silica 05 Bentonite D: Boron Based Engobe (D3) 51 Grolleg 24 FF3134 20 Silica 05 Bentonite E: Strontium Based Engobe (E3) 50 Grolleg 28 Silica 17 Strontium Carbonate 05 Bentonite |
F: Calcium Based Engobe (F3) 52 Grolleg 30 Silica 13 Whiting 05 Bentonite G: Lithium Based Engobe (G3) 33 Grolleg 33 Silica 20 EPK 09 Lithium Carbonate 05 Bentonite K: Magnesium Based Engobe (K3) 30 Grolleg 25 EPK 20 Silica 20 Talc 05 Bentonite |
An Earlier Test using the same fluxes, but with a less "fluxy" unity formula 6% Titanium Dioxide and 6% Rutile |
4% Copper Carbonate |
6% Iron Oxide |
6% Titanium Dioxide and 6% Rutile |