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

Me, too. I use food coloring to do activities with mixing colors. I never thought about egg dyes.Cool! But would they be cheaper than food coloring? I will find out today after school. Barbara Bay
P.S. Could someone out there point me to a website or explain why the primary colors of pigment are cyan, yellow, and magenta in our textbooks (and in our color printers), but the art teachers (at least in HS) insist they are not the primary colors of pigment??? I do not know enough about art to answer the questions my art students pose. We do activities where they discover what their textbook says is true, but I don't know how to answer when they want to reconcile what they learned in my class with what their art teachers say. Maybe it is because I too have some of those misconceptions, and/or just a big hole in my knowledge.

Krishna Chowdary <chowdark@evergreen.edu> wrote: On Sun, Mar 23, 2008 at 9:58 PM, John Denker 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
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