Alisa og Claus Clausen on sun 10 feb 02
Glaze test for: Metallic Black, cone 6, ox.
All tests fired on white, iron flecked, mid-range stoneware.
Fired to cone 6 (1220c) in oxidation.
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)
5.0 EPK Kaolin
10.7 Gerstely Borate
4.0 Copper Carb.
4.0 Manganese Diox. (Hazard)
3.0 Cobalt Carbonate
All raw materials measured up or down to nearest whole decimal.
Oxides used on percent basis to a 100 gram batch of glaze.
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