The pots are reduction-fired to cone 12, about 1300C, in a propane fuelled kiln.
They are positioned in the kiln to exploit glaze variations arising from the expected
patterns of temperature and oxygen level. The firing conditions are monitored using
cones, thermocouples and an oxygen sensor. The compositions of the glazes and clays
and the glaze thickness are varied to yield a wide range of colours and surfaces.
Glazes are made with a range of fluxes and oxides such as iron, copper, chromium
or titanium. Porcelains and stonewares are used, often in blends, to complement the
Understanding what affects the appearance of a pot is helped by number-stamping and
photographing each pot. The photographs are linked to a database, detailing the glaze,
the clay body, the position of each pot in the kiln and the firing conditions. This
approach is invaluable in digesting and recalling the results from around 20 glazes
and 10 clay bodies. It also helps to uncover trends that are sources of ideas for
subsequent pots and tests.