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TRANSMUTATION GLAZE
Example for
1100C
10
Feldspar
05
Flint
50 Lead
Bisilicate
10
Whiting
15 Zinc
Oxide
10 Titanium
dioxide
This recipe comes straight from the Potter's Dictionary of
Materials and Techniques. Referred to, (by me), as the Potter's
Bible.
Translated in local materials it reads as
follows:
10 GS 5515 Feldspar
Potash
05 GS 5016 Kwarts
superfijn
50 FR 2950 Lead
Bisilicate
10 GS 4201 Calicium
Carbonate
15 GS 6504 Zinc
Oxide
10 GS 5905 Titanium
Dioxide
Ref. numbers are from Silex.
This glaze picks up oxides from
inside the clay body and any oxides applied to the surface of the article. The
above recipe fired to 1085C has a matt finish. Can also be applied over or under
other glazes prior to firing. Results can be most pleasing. However applying the
glaze can be bit tricky as glaze tends to flake of prior to the firing if
applied wrongly. Have been told that replacing the raw zinc with calcinated zinc
alleviates this problem. Have never tried this as, over the years, I learned to
handle the glaze.
Purely by chance I discovered that giving the
unfired transmutation a coating of a clear base glaze, resulted in a shiny
streaky finish.
After a bit of experimenting I came up with the
following recipe.
40
Transmutation glaze according to above recipe
60 Lead/Less Transparent Glaze (SG 1800)
The spectacular result in one application.
Right now
I am back to basics where I use the (matt) transmutation glaze and applying the
transparent only where I want the spectacular shiny bits.
In all
cases flaking of the glaze during application can occur. Like when applying a
second coat when the first coat is already dry.
I always fire to
1085°C with a long soak at the end. And as a rule all glazes are applied
with a spray gun.
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