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Example of flashing on ware from a Manabigama wood fired kiln

From Robert Self. This firing went past cone 13. The body is Laguna Speckstone.

Example of flashing from wood firing

Made by Robert Self. This is Laguna White Stoneware body fired to cone 13 in a Manabigama wood fired kiln.

This piece is thrown from calcined kaolin

Calcined kaolin has zero plasticity. 25% bentonite had to be added to make it plastic enough to make this piece. Why bother? Because this will flash heavily in reduction firing.

Soda fired porcelain vessel by Heather Lepp

This is a small cup-sized object made from Plainsman P600 (simply composed of Tile #6 kaolin, nepheline syenite and quartz). It is valued as a product-of-the-process piece, consigned to the "kiln God" as unglazed. It exhibits carbon-trap, soda glaze deposition and flashing. The soda-vapour atmosphere of the kiln glazed one side of the vessel early enough in the firing to trap carbon under a crystal-clear glass. Often such glazes are crazed, but this one likely is not because the body contains 25% quartz, giving it a high thermal expansion. The other side of the piece exhibits tones of red, brown and yellow on the bare, vitreous porcelain surface - this is characteristic of "flashing".

Related Information

Links

Glossary Salt firing
Salt firing is a process where unglazed ware is fired to high temperatures and salt is introduced to produce a vapor that glazes the ware.
Glossary Wood Firing

By Tony Hansen


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