Alisa Clausen on fri 28 may 04
Glaze test for Pete Pinnell's Grey Green, cone 6, oxidation.
John Hesselberth has tested this glaze for Copper Leaching and =
recommends this glaze for decorative use only.
=20
Source: clay Times, March/April, 2004
Credited to: Pete Pinnell
Firing ramp:
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
Recipe:
8.5 Frit 3134 Used Frit J
26 Neph. Syenite
27.3 Spodumene
15.5 Strontium Carb.
14.3 Grolleg China Clay =20
7.0 Silica
1.4 Lithium Carb.
ADD
3 Copper Carb.
5.0 Titanium Oxide
or
4 Copper Carb.
5.0 Titanium Oxide
or=20
5.0 Copper Carb.
5.0 Titanium Oxide
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:
Applied thick.
3% Copper Carb.
A mat glaze with a dry but well melted surface. Color is Green to grey =
where thickest brown where thinner. Resembles the original=20
Weathered Bronze, but greyer overall. There are green flecks that break =
through the surface of the glaze.
4% Copper Carb.
Same as above surface. Much greener overall with many green flecks =
joining over a grayish ground surface color. Small crystals are more =
obvious on surface and has a slightly lichen effect in some areas where =
thicker.
5% Copper Carb.
Same as above surface but now the green specs are brighter. Therefore =
there is a stronger contrast between them and the grey ground.
The ground is browner where thinner, but the green is as strong.
Regards from Alisa in Denmark
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