On Jun 13, 4:49 pm, Dan wrote:
Richard Riley wrote:

...

Godspeed, Mr. Wizard.

I remember him too.


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.


As I recall Starch is used as an indicator
for iodine. I suppose if you had a little starch
suspended in water and a little iodine dissolved
in alcohol, then mix the two, the iodine will
drop out of solution and the resultant mixture
will be black.

Iodine dissolved in alcohol has a reddish color
(the familiar tincture of iodine). By the smell of
it, this is done by adding ammonia to produce
a clear solution.

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FF