Alisa og Claus Clausen on wed 10 oct 01
Glaze test for: Revised Simple Blue, cone 6, ox.
Source: Chris Clarke
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.
Revised Recipe:
38 Forshammer Feldspar
29 Silica
23 Wollastonite
10 Kaolin
ADD
2 Cobalt Ox.
1 Tin Ox.
Original Recipe:
40 Custer spar
30 Silica
20 Whiting
10 Kaolin
2 Cobalt Ox.
1 Tin Ox.
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:
A shiny but not glassy, cobalt blue glaze. Medium blue in color
and even covering. Stayed where glazed.
Slightly darker and slightly less glossy than original recipe.
Best regards, Alisa
in Denmark
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