search  current discussion  categories  glazes - cone 4-7 

glaze test for costello carbonate, cone 6 ox. jayne shatz cm article

updated wed 10 may 06


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


6 Barium Carb.

20 G.B.

2 Whiting

45 Custer Spar

2 Tennessee Ball Clay

25 Silica


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.


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