iandol on sat 9 mar 02
Dear Michele Williams,
I would not like to pour cold water on this idea of a cobalt red. but I =
think the best anyone will ever get is a violet colouration into the =
standard cobalt blue. Anyone expecting a strong cadmium type spectral =
red is, in my opinion, in for a disappointment. My reading of the =
literature suggests that it will occur in an oxidising atmosphere, as =
in, Pure Oxygen at about 300 Atmospheres pressure.
Ever hopeful,
Ivor Lewis. Redhill, South Australia
Michele Williams on mon 11 mar 02
What I've seen wasn't a cobalt red. What I saw was cobalt that became red
and blue streaked with reds only where the glaze broke on texture lines
(carved areas), the outward bulge of base "bellies" and "chests", and rims.
The reddish streaking sometimes occurred with the blue for a length of
nearly 1 1/2" in some cases. It was spectacularly gorgeous--I just wanted
to jump into the glaze on the spot. Swim around in it. And he says he does
this with cobalt and rutile...it's his secret. We get to watch & wonder.
Michele Williams
----- Original Message -----
From: "iandol"
To:
Sent: Saturday, March 09, 2002 2:16 AM
Subject: : Changing cobalt based colors in glazes?
Dear Michele Williams,
I would not like to pour cold water on this idea of a cobalt red. but I
think the best anyone will ever get is a violet colouration into the
standard cobalt blue. Anyone expecting a strong cadmium type spectral red
is, in my opinion, in for a disappointment. My reading of the literature
suggests that it will occur in an oxidising atmosphere, as in, Pure Oxygen
at about 300 Atmospheres pressure.
Ever hopeful,
Ivor Lewis. Redhill, South Australia
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iandol on tue 12 mar 02
Dear Michele Williams,
This sounds like very interesting Glaze Chemistry. If the recipe has not =
been revealed I would suspect that it may contain some form of magnesia =
as well as the Titanium compound.=20
Thanks for the return comment.
Ivor.
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