Grimmer on wed 28 jan 98
Ric Swenson wrote:
> Spanish Red Iron Oxide is a standard type. Others may be just as good or
> a.k.a. Ferric Oxide Fe2O3
According to Tom Buck in a post off-list, Spanish Iron is an
extremely pure form of iron oxide. It is produced as a byproduct of
a particular bacteria in ferrous sulphate, of all things. Regular red
iron oxide can contain any number of impurities, including
silicates and metallic iron. It's not as pure. Did I misunderstand
> >2. ULTROX - What is it and where do you go to get it?
> Superpax, Ultrox, Opax, etc, are all BRAND NAMES for Titania, and Titanium
> Dioxide is used coomonly in paint and in ceramic glazes to opacify.
It's my impression that Opaz, Superpax, Zircopax, Ultrox, et al,
were all Zirconium Silicates, not Titania. Is there a difference
between these opacifiers?
sixty and sunny tomorrow. weird.