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glaze test forrevised for marges clear (snowflake), cone 6. ox.

updated thu 11 oct 01


Alisa og Claus Clausen on wed 10 oct 01

Glaze test for: Revised for Marges Clear (Snowflake), cone 6.

Original recipe from Chris Clarke.

All tests fired on white, mid-range stoneware.

Fired in 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.

Recipe:  Revised.

35 Forshammer Feldspar

16 Silica

17 Zinc

12 Ball Clay

20 Wollastonite


3 Copper Carb.

2 Rutile

1 Zircopax

Original recipe:

17 Whiting

35 Spar

12 Ball Clay

19 Silica

17 Zinc ox.


All raw materials measured up or down to nearest whole decimal.

Oxides used on percent basis to a 100 gram batch of glaze.


Resulted in:

Slightly lighter, more cornflower blue than original cobalt
blue.  Streaking and movement in a gloss surface.

Pools to attractive medium, bright blue.  Stayed where glazed.

Best regards, Alisa

in Denmark