Alisa Liskin Clausen on tue 9 may 06
Glaze test for Costello Carbonate, cone 6, ox.
Source: CM, September 2005 Jayne Shatz article
Credited to:
Fired on mid fire white stoneware.
Firing ramp with an electric controller is:
100c p/h to 600c (212f - 1112f)
150c p/h to 1140c (302f - 2084f)
80c p/h to 1220c (176f - 2228f)
15 min. soak
cool down max. to 900c (1652f)
Hold 1 hour
Shut off kiln
Recipe:
6 Barium Carb.
20 G.B.
2 Whiting
45 Custer Spar
2 Tennessee Ball Clay
25 Silica
ADD
6 Copper Carb.
Note: All raw materials are measured up or down to the nearest half
decimal. Colorants or additives to a 100 gram batch are measured in percent
to the 100 gram batch.
Results:
Gloss, transparent, medium green glaze. color is slightly mossy, like a
dark leaf green. Recommended by Shatz to try over Rutile mat as a
decorative addition.
Regards from Alisa in Denmark
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