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:re; soda ash wash

updated sat 1 jul 00


iandol on fri 30 jun 00

Dear Anne Novak

If your soda ash wash is applied to your clay sculptures it will melt in =
situ and react with the clay without changing into a vapour or a gas.

There is a reference to this in Durrant, General and Inorganic =
Chemistry. Sodium Carbonate rapidly decomposes when brought to red heat =
in contact with porcelain.

Some Ball Clays give a superb orange peel which has a bright orange =
colour when fired in a salt glazing kiln in the traditional fashion. =
Perhaps he was trying to emulate this effect.


Ivor Lewis.