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glaze test for pete pinnell's grey green, cone 6, oxidation.

updated sat 29 may 04


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.

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

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.

3 Copper Carb.
5.0 Titanium Oxide


4 Copper Carb.
5.0 Titanium Oxide


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.


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 =

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