Alisa Clausen on thu 3 feb 05
Glaze test for Emmanuel Cooper Blue Speckled mat, cone 5-6.
Glaze tested on white midrange stoneware fired in electric oxidation to =
1240c. (2264f)
Source: Clay Times, Nov/Dec. 2004
Credited to:
Firing ramp:
100c p/h to 600c (212f - 1112f)
150c p/h to 1140c (302f - 2084f)=20
80c p/h to 1240c (176f - 2264f)
5 min. soak
cool down max. to 800c (1472f)
Hold 1 hour
Shut off kiln
Recipe:
55 Potash
10 Lithium Carb.
10 Whiting
5 Ball Clay
20 Silica
ADD
0,25 Cobalt Carb.
Note: All raw materials are measured up or down to the nearest whole =
decimal. =20
Colorants or additives to a 100 gram test batch are measured in percent =
to the 100 gram test batch.
Results:
Gloss, medium blue glaze. Transparent and iron specks from clay body =
come through.
1 Copper Carb.=20
1 Cobalt Carb.
Semi mat, smooth glaze, very dark blue with slight crystal formation on =
surface. Very covering and opaque.
2 Copper Carb.
Gloss, pale green glaze. Crazed over all.
10 RIO
Gloss, dark glaze, breaking very dark grown to black.
Regards from Alisa in Denmark
| |
|
