What are glowsticks made out of?

Anatomy of a glow stick: Inner glass capsule containing a mixture of hydrogen peroxide and a phthalate ester solvent. Outer soft plastic capsule (in the form of a stick, necklace, earrings, button, whatever...) containing phenyl oxalate ester and fluorescent dye. Snap the inner capsule, and the resulting mixture frantically transfers oxygen atoms around, creating an unstable compound that gives off energy to the dye, then decomposes into carbon dioxide. The energized dye radiates the colored light you see in the light stick. In a cold environment, the chemical reaction is slowed so the light is dimmer but longer lasting. The opposite, of course, if it's hot.