My high school chem teacher did that for us in my junior year of high
school. I'm almost certain those (1960) notes are gone by now, but I can
ask our chem department how it is done. Evidently it is a rather common
demonstration.

However, they won't be back until August. Remind me?

Jim

--
"Dream as if you'll live forever. Live as if you'll die today."
--James Dean


The one demonstration he did that I wish I knew how he did it was when
he poured a pitcher of a clear liquid into another clear liquid and they
both suddenly went black in the middle of the pour.

Dan, U.S. Air Force, retired