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glaze test for oxides under bone glaze, cone 6, ox.

updated sun 17 nov 02


Alisa Liskin Clausen on sat 16 nov 02

Glaze test for oxides under Bone Glaze, cone 6, ox.

Glaze tested on white midrange stoneware fired in electric oxidation to =

Source: Mastering Cone 6 Glazes
Credited to: John Hesselberth and Ron Roy

Firing ramp:
100c p/h to 600c (212f - 1112f)
150c p/h to 1100c (330f - 2012f)=20
100c p/h to 1220c (212f - 2228f)
cool down max. per hour to 1100c=20
cool 80c per hour to 800c
shut off kiln

Please refer to above book, pages 89, 90.=20

Note: All raw materials are measured up or down to the nearest whole =
decimal. =20
Colorants or additives to a 100 gram test batch are measured in percent =
to the 100 gram test batch.


A semi gloss bone colored glaze. Oxides Cobalt, RIO, black stain, =
Chrome and Ocher showed well but muted under the glaze. The edges are =
sharp and stayed as painted. =20
The Chrome turned dark tan, with a slightly green cast. Cobalt is =

Regards from Alisa in Denmark