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glaze test for rosie's red, cone 6, oxidation

updated thu 24 jan 02


Alisa og Claus Clausen on wed 23 jan 02

Glaze test for: Glaze test for Rosie's Red, 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)

29.7 Flint
5.0 Kaolin
19.8 Kona f-4 Feldspar
13.9 Talc
31.7 Gerstley Borate

15 RIO

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

Forshammer Spar for Kona F-4

Resulted in:
Dark brown gloss with rust colored spots where glaze lay lowests and
thickest. Black gloss where glaze went over high spots and
where thinnest.

Will re-fire in bisque to see if it goes redder.

Regards from Alisa in Denmark