Janet H Walker on sun 20 sep 98
...pretty horrible after firing to cone 6 in oxidation...
...looks terrific after re-firing it to cone 06--colorwise, anyway...
This is a common phenomenon with glazes that are supposed to be
"iron red". The best explanation I've seen of this is in Hamer.
The non-technical part of the explanation is that you have to spend
a lot of time between 700C and 900C in order for the color to develop.
This can be done in several ways -- multiple firings (as you did) or
with controlled long slow cool-down on the first firing. I use the
slow cooldown method because I have a controller but if you do
regular bisque firings, you can always stick the iron red pots into
the next bisque to "brighten them up".
Jan Walker
Cambridge MA
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