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.)
Are there any companies that still sell this material?
Larry E. Whittington