Alisa og Claus Clausen on wed 10 oct 01
Glaze test for: Colorants; Tony Hansen 20 x 5
The purpose for these tests below is to further work with limited
bases, such as a gloss, a matt and a decorative structured surface, and
develop a working range of added colorants for each base.
All tests fired on white, mid-range stoneware.
Fired in to cone 6 (1220c) in oxidation.
Firing ramp:
100c (212f) per hour to 600c (1112f)
150c (302f) per hour to 1100c (2012f)
100c per hour to 1220c (2228f)
15 - 30 minute soak depending on matts and glosses used.
Recipe:
20 3134
20 EPK
20 Silica
20 Custer Spar
20 Wollastonite
Note:
All raw materials measured up or down to nearest whole decimal.
Oxides used on percent basis to a 100 gram batch of glaze.
Substitutions:
Local Frit for 3134
Resulted in:
4 Rutile
5 Copper Carb.
(colorants from Karen's Starshine Aqua)
Fluid but not runny, cream colored base with streaking of orange and
greenish hues. Could be a good over glaze.
Gloss surface. Pooled cream and went transparent over high parts of
texture. Orange speckling is interesting.
2 Cobalt Oxide
4 Copper Carb.
4 Manganese Diox.
(colorants from M.B. Metallic Black)
Metallic black surface, but not as dense as original glaze. No
movement. A good black.
3 Cobalt Carb.
1 Zircopax
2 Rutile
Very glossy cobalt blue, runny. Nix, 86ed it. no
good.
3 Copper Carb.
Light green, glassy, gloss. Moved, but did not run. Looks
like it could. Bottle glass green.
5 Copper Carb.
4 Rutile
Streaky, fluid. slightly runny gloss, with green and brownish
streaks. Some cream mottling in overall background color.
Crazed where very, very thick.
2 RIO
3 Rutile
(from Chris Wolff's Cream Gloss)
Semi matt surface, with brown ground. Thickest areas creamy and
also greenish brown. A nice surface. with movement, but stayed
where put.
6 Zinc Oxide
3 Copper Carb.
(from Shiny Soft Green with Pink Specs.)
The best for last.
A semi matt hard surface with an overall greyish black ground.
Green streaking and pooling. The edges of the
streaking are fuzzy and undefined. Has a slightly metallic
look. A patina like glaze that is not dry like Pete Pinnels great
bronze glaze, but instead has a smooth, waxy feel.
Best regards, Alisa
in Denmark
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