Alisa og Claus Clausen on fri 12 oct 01
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>Date: Wed, 10 Oct 2001 11:36:01 +0200
>Reply-To: Ceramic Arts Discussion List
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>From: Alisa og Claus Clausen
>Subject: Glaze test for Colorants;, Tony Hansen 20 x 5
>To: CLAYART@LSV.CERAMICS.ORG
>
>
>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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Glaze test for:
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:
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:
Resulted in:
Best regards, Alisa
in Denmark
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