An adult should complete steps 2 through 4 without letting the children see. Dampen an M&M and make a smudge on a coffee filter strip about a third of the way up. This is the candy evidence that was found at the crime scene.
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Use chromatography to separate the pigments in leaves and see what they're made of.
Try this simple activity to change the color of a flower.
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Feel the physics and consider the chemistry of natural phenomena like tornados and avalanches.