Glow sticks are plastic tubes which can be short, stiff cylinders or longer, narrow tubes which are malleable and connected to together to make long chains. The sticks glow due to a chemical reaction, initiated by cracking the inside of the tubes, allowing the chemicals within to mix and begin their glowing reaction. The rate and intensity of the chemical reaction is altered by the temperature at which it occurs, allowing you to preserve, and temporarily recharge, the glow of the sticks by adjusting their temperature.
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When you are done using the glow sticks, place them into a freezer. This slows or even stops the chemical reaction inside the stick. The reaction is then preserved for later use, and can be made to glow again by removing the sticks from the freezer.
You can also dip the glowstick that has stopped glowing into a pot of boiling water. If there are any chemicals remaining in the glow stick, the intense heat will trigger it to react again. This will produce a glow.
Use a pair of tongs to remove the glow stick after 15 seconds. Set the stick aside and check the temperature with brief touches to ensure it has cooled enough to be safely worn again.
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