Alisa Clausen on wed 27 feb 08
Glaze test for Lana's Metallic Black, ^6 ox.
Credited to: Ron Roy, John Hesselberth, 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 Metallic Black (MC6G Glossy Base 2)
Cone: 6 Color:
Firing: Surface: Metallic
26 Frit--Ferro 3134
5 Iron Oxide--Red
2 Manganese Dioxide
2 Cobalt Oxide
1 Chromium Oxide
1 Titanium Dioxide
Glossy, black covering glaze. Looks black from a distrance, but has a lot
of white fur when viewed close up. This test has 2% Titanium Diox. to get
the fur in the surface. Use less for a more even black.
Note to Alisa from John Hesselberth regarding food safety:
I did test it in November of 2004.
Documented on page 33 of my notebook G2.
Anyhow it tested great:
Cobalt 0.03 mg/l
Manganese <0.02 mg/l
Chromium <0.02 mg/l
I used Licorice as a control and got 0.06 mg/l on it. Those numbers are all
the same. When they get that small you get a fair amount of variability.