Alisa og Claus Clausen on sun 10 feb 02
Glaze test for: Grey Green Mat, cone 6, ox.
Source: Frogpond Pottery
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:
40 Custer Spar
122.3 Gerstely Borate
12.2 EPK
14.6 Whiting
19.8 Talc
1.2 Bentonite
ADD
4.8 Copper Carb.
7.9 Zircopax
Note:
All raw materials measured up or down to nearest whole decimal.
Oxides (noted as ADD) used on percent basis to a 100 gram batch of glaze.
Substitutions:
Forshammer Spar for Custer Spar
Resulted in:
A well covering grayish green mat, with a well covering surface. Where
very, very thick in the crevices of the tile, it dripped. Otherwise it
looks like a light olive green mat glaze that stayed above the line where
it was dipped on the tile.
This glaze is very mat but not dry.
Regards from Alisa in Denmark
Ron Roy on tue 12 feb 02
I think the amount of GB should be 12.3 - (not 122.3) so the total would be
100.0?
RR
>Glaze test for: Grey Green Mat, cone 6, ox.
>
>Source: Frogpond Pottery
>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:
>40 Custer Spar
>122.3 Gerstely Borate
>12.2 EPK
>14.6 Whiting
>19.8 Talc
>1.2 Bentonite
>
>ADD
>4.8 Copper Carb.
>7.9 Zircopax
>
>Note:
>All raw materials measured up or down to nearest whole decimal.
>Oxides (noted as ADD) used on percent basis to a 100 gram batch of glaze.
>
>Substitutions:
>Forshammer Spar for Custer Spar
>
>Resulted in:
>A well covering grayish green mat, with a well covering surface. Where
>very, very thick in the crevices of the tile, it dripped. Otherwise it
>looks like a light olive green mat glaze that stayed above the line where
>it was dipped on the tile.
>This glaze is very mat but not dry.
>
>Regards from Alisa in Denmark
>
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Ron Roy
RR# 4
15084 Little Lake Rd..
Brighton,
Ontario, Canada
KOK 1H0
Residence 613-475-9544
Studio 613-475-3715
Fax 613-475-3513
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