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[Phys-l] experiments with dyes (was: happy equinox)



On Sun, Mar 23, 2008 at 9:58 PM, John Denker <jsd@av8n.com> wrote:
2) Remember, now is the time to stock up on a year's supply of
"egg" dyes. Today they are half price or so ... and soon they
won't be conveniently available at any price until next year.

It's nice to have some on hand. They don't spoil. There's lots
of good experiments to do with dyes; the physics of dyes is
nontrivial, and students (not to mention grownups) have many
misconceptions about it.

John - thanks for the reminder about dyes.

I'd like to hear about some "good experiments to do with dyes".

I'm interested both in straightforward demonstrations and experiments
as well as the nontrivial ones and ones that get at misconceptions.
I'm pretty sure that I have some (maybe lots) of these misconceptions,
and I'd like to learn more.

regards
-Krishna