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WHITE SLIP
Silica Cornwall Stone Ball Clay EPK |
35 15 10 40 100 |
WHITE SLIP: There are lots of good formulae and this one has been good for me.
It does not fully mature below c10, and drips can cause peeling if it is too thick |
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TENMOKU
Albany Slip Apple Ash Custer Feldspar Red Art Clay Gold Art Clay Red Iron Oxide |
20 15 60 20 4 3 123 |
TENMOKU has five sources of iron. While it has some Albany slip, it is basically a feldspathic/apple ash glaze,
thus it does not run badly until above c14. If it is too transparent, you can decrease the apple ash, or increase the gold art clay. |
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WOOD ASH
Gold Art Clay Hardwood Ash Cornwall Stone Custer Feldspar Bentonite |
10 40 40 110 4 204 |
Basically WOOD ASH is a transparent Karatsu Japan style glaze. It is called egaratsu in Japanese.
On a triaxial chart, (feldspar/silica/wood ash) it is in the feldspar corner, with Cornwall Stone added to increase the silica, and wood ash to make it more transparent. |
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STRAW ASH
Hardwood Ash Straw Ash Flint Custer Feldspar Bentonite |
40 20 30 30 120 3% |
STRAW ASH glaze is interesting for the possibilities of achieving color at high temperature. It is a high silica glaze, 1-2% rutile, powdered or fine granular gives yellow and orange. Copper gives tomato green at 5%. Cobalt gives deep blue at 5-8% with pink crystals when thick. |
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NANDA’S CELADON
Whiting Flint Custer Feldspar Red Art Clay Bentonite |
15 20 65 12 112 3% |
NANDA’S CELADON is a glaze designed by a student many years ago. The interesting ingredient is the red art clay as a source of iron instead of red iron oxide. The glaze needs to be screened at 100 mesh to eliminate speckles. 12% red clay from anywhere will work. |
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HARA SHINO
Custer Feldspar Whiting EPK Flint Cornwall Stone |
60 10 10 12 8 100 |
HARA SHINO: This formula is from my first Japanese teacher, and it reflects the kind of Shino used in his native Kyoto, not the classic white/red/grey Shino Glazes. |
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SHINO
Nepheline Syenite Spodumene Ball Clay EPK Bentonite |
50 20 15 10 95 3% |
My SHINO glaze is adapted from Michael Cardew’s “Pioneer Pottery”. Go to Chapter 8: Glazes: Iron-red glaze.(Page 144 in my old paperback edition, 1973) Following Cardew, Nephelene Syenite has a good low alumina/silica ratio, and Spodumene and Lepidolite both have LiO, the only other possible flux, and suitable ratio to silica. Calcium will turn the glaze brown. The Ball Clay/EPK ration will adjust the possibility for crawling. |
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CHUN Custer Feldspar Flint Wallistonite Apple Ash Magnetite Bentonite |
56 22 13 9 2 102 3% |
A true CHUN Blue glaze is an optical color, not one derived from Cobalt. This is really an Iron blue using Magnetite as a colorant. My source is from an abandoned mine in the Adirondacks. It is a magnetic form of black iron oxide with a contamination of Illmanite. Wallistonite works better than Calcium in developing the color. Copper Carbonite mixed with a little glaze painted under this glaze will develop copper reds on porcelain in a good reduction firing. |
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