Typical commercial glow sticks contain a hydrogen peroxide solution, a phenyl oxalate ester solution, and a fluorescent dye. The fluorescent dye is what gives the glow stick its color, so different kinds of dyes are used to produce different colors in a glow stick.
To answer your question, the difference between a yellow and pink glow stick is simply the fluorescent dye used. Each color is produced by a different dye.
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There are certain fluorescent dyes used to release specific colors. The dye that causes the fluorescent yellow is 1-chloro-9, 10-bis(phenylethynyl) anthracene Rubrene. This is a different dye than pink, which is also a bit more tricky. to get a hot pink you must first have 2,4-dl-tert-butylphenyl 1,4,5,8-tetracarboxynaphthalene diamide–a deep red dye–and add DPA in order to get that hot pink color.
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