Colours of Light Sticks 

                                                                                                                   http://theepicenter.com/glowsticks_and_chemical_light_sticks.html            

These are some fluorescent dyes that may be added to light sticks to release different coloured light:

Red coloured light sticks tend not to use dyes like rhodamine B due to their instability when stored with the other chemicals in the reaction.  Instead, the plastic tube is encased with a fluorescent red pigment which absorbs the energy (at yellow wavelengths) emitted in the reaction and re-emits it as red.

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