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Woodfiring has an age-old tradition in ceramics. The very first ceramics ever fired were done (probably accidently) in camp fires and rudimentary kilns thousands of years ago. Under woodfiring we now understand firing a brick kiln with wood as fuel. This necessitates a a certain kiln contsruction type, sometimes with several burning chambers and stoking ports for feeding in the wood. As the wood burns, ash is created which deposits itself on pots in the kiln, creating a natural 'wood ash' glaze. These natural glazes are made from silica, potash, calcia and other various ingredients that form naturally in the burnt wood.