iandol on thu 19 sep 02
Dear Sylvia
You ask, in response to my suggestion that it might be due to Oxygen =
evolution from Red Iron Oxide "when refiring at a lower top temperature =
than the original firing, it could be because iron( or whatever?) in =
the glaze or underlying body had already finished the outgassing it =
would do at that particular temperature during the first"
This seems to be a reasonable proposition to me. I suppose it could also =
be argued that if the original reaction had not been take to completion =
that were the pots to be taken to a higher maturing temperature there =
would be reactivation of the reaction in the under layer.
Best regards,
Ivor
firing.
??
Sylvia
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