Rachelle Raphael on wed 15 feb 06
Someone in our studio recently made a Celedon IV glaze from a recipe and used
yellow ochre instead of red iron oxide. Another potter just glazed a lot of
porcelain pieces with this glaze before realizing it was a different color from
the old Celedon IV (yellow vs. red in liquid form)
Does anybody know if this change is ok? What difference in final, fired
color, will this result in? We will test it soon but in the meantime should Susan
wash her pots off?
Unfortunately this happens far too often in a studio of ten people and lots
of odd/old chemicals. We end up with a fair amount of mystery glazes, although
some have been un-repeatable beauts!
Thanks for the help
rachelle
following my heart and learning to be a potter
and doesn't grok glazes yet
Ivor and Olive Lewis on fri 17 feb 06
Dear Rachelle Raphael,=20
My guess is that the colour will not be as intense as you might get from =
RIO. Yellow Iron Oxide, Limonite, is a hydrated Hydroxide of Iron. I =
think a familiar name is Yellow Ochre
Test and tie a test tile to the bucket.
Best regards,
Ivor
Snail Scott on fri 17 feb 06
At 05:15 PM 2/17/2006 +1030, you wrote:
>...Yellow Iron Oxide, Limonite, is a hydrated Hydroxide of Iron. I think a
familiar name is Yellow Ochre.
Yellow iron oxide is presumed to be close to pure,
while yellow ochre has a lot of clay in it. If
you swap themn, you'll need to test to see how
strong your yellow ochre is by comparison. It
can vary a lot.
-Snail
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