Sunday, September 19, 2010

Kiln opening

Here are the results from the gas reduction firing we did on Thursday. The pieces were glazed in two classic Chinese reduction glazes - Celadon and Copper Red. They were fired to 1300 degrees C (Cone 10).  A 'reduction' means that the oxygen is shut off to the kiln, creating a smoky atmosphere, starving the glaze components of oxygen.

The iron that gave the celadon glaze a pink appearance before firing (see the last post) is transformed to a beautiful pale green, and the copper- which would turn bright green in an oxidised firing - is a deep red, hence the name: Copper Red.

Here's a short video we made showing the kiln just after opening the door - you can hear the celadon making little 'ting' sounds as the glaze cools down and cracks. Days later, the pieces are still going 'ting!' from time to time as the glaze continues to develop its crackle effect.

And a You Tube video showing the traditional techniques of Longquan celadon in China:

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