Alisa og Claus Clausen on sun 10 feb 02
Glaze test for: Metallic Black, cone 6, ox.
Source: www.frogpondpottery.com
Credited to:
All tests fired on white, iron flecked, mid-range stoneware.
Fired 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.
cool down 100c per hour to 900c.
Natural cool down to 150c (approximately 15 hours)
Recipe:
5.0 EPK Kaolin
78.9 Custerspar
5.5 Whiting
10.7 Gerstely Borate
ADD
4.0 Copper Carb.
4.0 Manganese Diox. (Hazard)
3.0 Cobalt Carbonate
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:
None
Resulted in:
a well covering black metallic glaze with a very smooth surface.
This recipe and result is very similar to Mary Barringer's Metallic Black
glaze, cone 6, ox. published in CM.
Regards from Alisa in Denmark
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