added a drop of blue and red food coloring and then let
a couple drops of soap drip into the milk.
The kids really, really enjoyed this experiment! I highly
recommend this one.
I've seen this experiment in a number of places, but there's
a good explanation of the science behind it all at:
http://www.abc.net.au/science/surfingscientist/pdf/lesson_1_amazing_science.pdf
on pages 6-7.
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