Alisa Clausen on wed 27 feb 08
Glaze test for Clear ^6 ox.
Source: Clayart
Credited to:
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: Clear ^6
Cone: 6 Color:
Firing: Surface: Glossy
Amount Ingredient
51 Nepheline Syenite
22 Gerstley Borate--1999
14 Wollastonite
8 Zinc Oxide
3 Titanium Dioxide
2
100 Total
Unity Oxide
.225 Na2O
.061 K2O
.016 MgO
.456 CaO
.242 ZnO
1.000 Total
.33 Al2O3
.2 B2O3
.001 Fe2O3
1.755 SiO2
.092 TiO2
5.3 Ratio
8.7 Exp
Comments: gloss, transluscent, crazed
John Sankey on sat 1 mar 08
Just to note that this is credited to Richard Zakin and is already
in the database as Zakin Clear. It does indeed have expansion on the
high side, but works perfectly if mixed as in the original, which is
fluid and thin (see http://sankey.ws/glazetest.html). The JM 169 frit
that Alisa subbed for the borate has a lot more silica, which would
raise the maturing temperature.
John Sankey
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