iandol on mon 29 sep 03
Dear Sandi Finney,
I know nothing about Shino Glazes (must get onto that deficit in my =
education!!) But I do know about Sodium Carbonate.
At Cone 012 Sodium Carbonate will be molten and react vigorously with =
any free silica which is available, creating a highly corrosive fluid =
fluxing situation. Since this fluid would seal the clay against the =
ingress of elemental carbon you would not have the anticipated staining =
effect. Further heating causes additional melting as the ingredients of =
your true Shino begin to fuse and alloy with the Sodium silicate. On =
cooling you have a green soda glass.
May I suggest a lighter hand with the soda brush.
Hope you have eventual success.
Ivor Lewis. Redhill, South Australia=20