I am looking for a source for Sissa (sp.). This is a white powder
that I have used as a pre polish for tumbling agate. This seems to
work very well when I then use cerium oxide as the polish. My
supply came from my brothers estate and I did not know his source.
(I think I read his notes correctly for the name of this material.)
The spelling is SISA, and you’ll find a few suppliers if you search
Google. Lortone seems to be the pre-eminent source. I have a bag in
the garage, and vaguely remember that it was an acronym for Silica
something. Information seems hard to come by.
One non-authoritative reference says it’s powdered quartz. But the
same reference says tripoli is also powdered quartz.
Bedrock Supply lists “SISA pre-polish aluminum oxide.” I don’t think
I’d trust that description.
If you find out what it is, please let us know.
Sun City, AZ