How to do a Pit-Firing

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How do I fire Bisque?

How to do a Pit-Firing

How to do a Pit-Firing
This is the sort of thing you can easily do in your own backyard (subject to local council regulations of course). It's a simple firing technique used in many ancient cultures across the globe and popular with potters today.
Here's How:
Dig a pit of the appropriate size, depending on the amount of work to be fired.
Place a bed of dry leaves and twigs and possibly coal, which will burn slowly, at the bottom of the pit
Place the pottery on top of this.
Carefully sprinkle oxides and carbonates around the pieces (particularly copper carbonate), which volatilize and result in flashes of color appearing on the fired work.
Cover the work with more leaves, twigs and dung (if available), building up a mound over the pieces.
Once the stacking process is finished, light the pile around the edges and leave to smolder for several hours, or until the next day.
Towards the end of the burning process, bury the pit in earth or sand, which will cut off the oxygen supply and create a strong reducing atmosphere inside the mound.
Allow the kiln to cool overnight and open the next day.
Remove excess scum with a wire brush under a running tap.

Additions of grog or volcanic ash 'open up' the clay and make it more resistant to heat shock.
The best color results can be achieved with iron bearing, or red clays.
Bisque firing the work first helps to prevent shattering and cracking.



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