Alisa Clausen on tue 24 jun 03
Glaze test for Frosty Black, cone 6, ox. PMI May/June 03
Glaze tested on white midrange stoneware fired in electric oxidation to =
1220c.
Source:
Credited to:
Firing ramp:
100c p/h to 600c (212f - 1112f)
150c p/h to 1100c (330f - 2012f)=20
100c p/h to 1220c (212f - 2228f)
5 min. soak
cool down max. to 800c
Hold 1 hour
Shut off kiln
Recipe:
32 Nepheline Syenite
23 Flint
23 Whiting
13 Kaolin
9 Zinc Ox.
ADD
Black iron Oxide
3 Cobalt Oxide
2 Black Copper Oxide
1 Manganese Diox. HAZARD
Note: All raw materials are measured up or down to the nearest whole =
decimal. =20
Colorants or additives to a 100 gram test batch are measured in precent =
to the 100 gram test batch.
Substitutions:
Red Iron Oxide for Black Iron Oxide
Results:
Semi gloss covering black ground with matte black frost on surface. =
Uniform covering from thinnest to thickest application.
Smooth to touch. Breaking areas are matte. Overall appearance is a =
lush, covering black glaze.
Subbed 26.7 Wollastonite for 23 Whiting.
Resulted in a glaze that was as covering, but slightly glossier in =
general. Overall, still a semi gloss glaze. Depth of black color is =
the same. Reduced matte frost on surface.
Regards from Alisa in Denmark
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