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I can't believe my original answer was deleted to put pure gibberish.

Two chemicals are kept separate until you "crack" the glow stick. When you crack it, the two chemicals mix together causing a chemical reaction.

in one capsule inside the plastic tube is Phenyl Oxalate and fluorescent dye solution, in the plastic tube is Hydrogen Peroxide solution. When the two mix, they produce a chemical reaction that produces chemiluminescence. (light from a chemical reaction)

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13y ago

What else can I help you with?