Alisa Clausen on sun 22 aug 04
Glaze test for White Bird Mat, cone 5-7, ox.
Glaze tested on white midrange stoneware fired in electric oxidation to =
Source:ClayTimes Jul/Aug 2004
100c p/h to 600c (212f - 1112f)
150c p/h to 1100c (330f - 2012f)=20
100c p/h to 1220c (212f - 2228f)
5 min. soak
cool down max. to 800c
Hold 1 hour
Shut off kiln
47 Neph. Syenite
10 Ball Clay
23 Gerstely Borate
Any combination of=20
Tin oxide and Zircopax to add up to 10-12%
Used 7 Tin oxide and 3 Zircopax
Note: All raw materials are measured up or down to the nearest whole =
Colorants or additives to a 100 gram test batch are measured in percent =
to the 100 gram test batch.
Base was an opaque white gloss glaze
White gloss with slight yellow cast.
White yellowish gloss
3.0 Copper carb.=20
Light green gloss
1.5 Cobalt Carb.
Runny opacified blue
1.2 Cobalt Carb. and 0.4 Chrome =20
Teal green gloss
Yellowish gloss, darker tan where it stayed in grooves of test tile.
This is only one test of the Tin Oxide and Zircopax in the proportions I =
I am sure the test with these opacifiers in different proportions will =
alter the overall surface and color=20
response of this glaze.
Regards from Alisa in Denmark