You can demonstrate the primary colors of light using glow sticks! When red, green, and blue cold light are mixed, you get white light. Simply activate the light stick (bend it until you hear a *crack* – that’s the little glass capsule inside breaking) and while wearing gloves, carefully slice off one end of the tube with strong cutters, being careful not to splash (do this over a sink).
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Sometimes the chemical light sticks contain a glowing green liquid encapsulated within a red or blue plastic tube, so when you slice it open to combine it with the other colors, it isn’t a true red. Be sure that your chemical light sticks contain a glowing RED LIQUID and BLUE LIQUID in a clear, colorless plastic tube, or this experiment won’t work.

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