History of the glow stick story of the glow stick Several US patents for "glow stick" type devices were received by various inventors. Bernard Dubrow and Eugene Daniel Guth patented a Packaged Chemiluminescent Material in June 1965 (Patent 3,774,022). In October 1973, Clarence W. Gilliam, David Iba Sr., and Thomas N. Hall were registered as inventors of the Chemical Lighting Device (Patent 3,764,796). In June, 1974 a patent for a Chemiluminescent Device was issued with Herbert P. Richter and Ruth E. Tedrick listed as the inventors (Patent 3,819,925).www.wikipedia.com
In January 1976, a patent was issued for the Chemiluminescent Signal Device, with Vincent J. Esposito, Steven M. Little, and John H. Lyons listed as the inventors (Patent 3,933,118). This patent recommended a single glass ampoule that is suspended in a second substance, that when broken and mixed together, provide the chemiluminescent light. The design also included a stand for the signal device so it could be thrown from a moving vehicle and remain standing in an upright position on the road. The idea was this would replace traditional emergency roadside flares and would be superior, since it was not a fire hazard, would be easier and safer to deploy, and would not be made ineffective if struck by passing vehicles. This design, with its single glass ampoule inside a plastic tube filled with a second substance that when bent breaks the glass and then is shaken to mix the substances, most closely resembles the typical glow stick sold today
the chemical reaction in glow sticks happens when dibutyl phthalaten and hydrogen peroxide are mixed together in phallic ester after the glass tube is cracked the chemicals mix and the but you might thing that glow sticks are endothermic but really its neither it gives off light but no heat its accuracy a exergonic(energy releasing) reaction tacks place as it gives off light energy but no heat.
The reactants are dibutyl phthalaten&hydrogen peroxide they mix in phallic ester to create light.This reaction is exergonic(energy releasing) not endothermic or exothermic. the product is light.
The signs of a chemical reaction is that the plastic tube is illuminated with light.