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Glo-Stik is the brand-name of a widespread single-use chemiluminescent tube, manufactured and distributed by Martz-Gephroen Laboratories. Glo-Stiks contain isolated chemicals which, when combined, produce extremely bright chemical luminescence; this is typically done by "cracking" the stick, breaking open the seal between the chemicals and allowing them to react. While initially developed for use by the UNSC Defence Force, as cheaper light-providing equipment than the flares commonly used by troops, the Glo-Stik found high appeal among the civilian populace, and has been since been sold commercially as well.