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The Liquid Rainbow
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Learners are challenged to discover the relative densities of colored liquids to create a rainbow pattern in a test tube.
See the Light
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Learners mix a solution of luminol with hydrogen peroxide to produce a reaction that gives off blue light.
Pearlescent Pigments
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This is written as a display, but can easily be adapted to a hands-on activity. Learners observe and shake containers of shiny liquids.