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glaze test for cartwright black. cone 6, ox.

updated mon 23 oct 06


Alisa Liskin Clausen on sun 22 oct 06

Glaze test for Cartwright Black, cone 6, ox.

Source: Clayart

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


73.5 Custer spar (used Forshammer feldspar)

4.1 GA Kaolin (used EPK)

5.1 Whiting

10 Gerstely Borate (used Boron Frit)

92.7 grams


4.1 Copper Carb.

2 Cobalt Carb.

10.2 RIO

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, metallic, opaque black glaze. Slightly brownish in strong sun light.

Regards from Alisa in Denmark