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glaze test for burboe glaze, cone 6 reduction, fired in oxidation.

updated mon 3 nov 03


Alisa Clausen on sun 2 nov 03

Glaze test for Burboe Glaze, cone 6 reduction, fired in oxidation.

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

Source: Clayart
Credited to:

Firing ramp:
100c p/h to 600c (212f - 1112f)
150c p/h to 1100c (330f - 2012f)=20
100c p/h to 1220c (212f - 2228f)
5 min. soak
cool down max. to 800c
Hold 1 hour
Shut off kiln

6.8 Bone Ash
6.8 Barium Carb.
11.4 Dolomite
2.3 Lithium Carb.
22.7 Albany
22.7 F4 Feldspar
27.3 OM4 Ball Clay

9.1 Opax
4.5 Zinc Oxide
2.3 Red Iron Oxide
2.3 Rutile

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 precent =
to the 100 gram test batch.

Oldenwalder clay for Albany
Feldshammer for F4
Zircon #5 for Opax

A mustard brown glaze with a varidgated surface. Areas of matte under a =
glossier surface with yellow speckling. Well covering glaze that is =
smooth to the touch. Stiff around bottom edge of tile even where thick.

Regards from Alisa in Denmark