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glaze test for chappell's clear semi gloss, cone 6, oxidation.

updated thu 24 jan 02


Alisa og Claus Clausen on wed 23 jan 02

Glaze test for Chappell's Clear Semi Gloss, cone 6, oxidation.

Source: Clayart
Credited to:

All tests fired on white, iron flecked, mid-range stoneware.
Fired to cone 6 (1220c) in oxidation.

Firing ramp:
100c (212f) per hour to 600c (1112f)
150c (302f) per hour to 1100c (2012f)
100c per hour to 1220c (2228f)
15 - 30 minute soak depending on matts and glosses used.
cool down 100c per hour to 900c.
Natural cool down to 150c (approximately 15 hours)


45.7 Kona F-4 Feldspar
15.2 Silica
12.7 Talc
12.9 Gerstely Borate
9.0 Dolomite
4.5 EPK
1.0 Bentonite

All raw materials measured up or down to nearest whole decimal.
Oxides used on percent basis to a 100 gram batch of glaze.

Forshammer Feldspar for Kona F-4.

Resulted in:
Clear semi gloss. The lines of Burgundy stain, RIO and Cobalt oxide all
came well through the glaze, with
stable edges. Has a satiny feel.

Regards from Alisa in Denmark