Alisa og Claus Clausen on sun 10 feb 02
Glaze test for: Broken or Mottled Blue, cone a6, ox.
Source: www.frogpondpottery.com
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)
Recipe:
50 Gerstley Borate
15 EPK Kaolin
35 Slica
ADD
1.5 Cobalt Carbonate
3.0 Copper Carb.
1.0 Dark Rutile
Note:
All raw materials measured up or down to nearest whole decimal.
Oxides used on percent basis to a 100 gram batch of glaze.
Substitutions:
Common Rutile for Dark Rutile
Resulted in:
A well covering medium to dark blue gloss glaze. Has a very nice fuzzy or
hazy texture under the surface of the gloss. Where thicker, it fuzzes up
more under the surface to give entire areas of breaking lighter blues.
A lot of changing nuances over the entire surface. Stayed where glazed.
Regards from Alisa in Denmark
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