Introduction
Fireworks are made of gunpowder and exploding chemicals that are ignited to explode. Fireworks are often used for celebrations. An example of this celebration is: New Year's; celebrated by people all around the globe.
"How Fireworks Inscribe the Sky"
Back in the day, pyrotechnics that form shapes come from a single shell that contains multiple colors and shapes. But there is no telling how the shape is gong to result when it explode. Designs can appear in diverse angles.
Threw the passing of time, based on technology softwares, designers can draw almost anything on the sky by a certain coordination that lets fly dozens of lights at once. The program controls each angle and height, it also signals the launch of complex designs.
References: Jancer, Matthew.(July2014). How Fireworks Inscribe the Sky. Popular Science (Vol.285 Issue 1, p22-23.1/4p)
"A greener green"
Green-colored pyrotechnics seem to be a problem. They are used in fireworks and for military signals, but they produce toxic chemical compounds and organic pollutants that can persist in the area were its being used. Safer alternatives to prevent these problems are too expensive or to fast-burning. Chemists have made experiments and may have found a solution: a chemical combination of boron, a cheap and common abrasive never before used in pyrotechnics. At high temperature, it reacts to form the green-emitting chemicals, without the toxic pollutants.
References: "A greener green." American Scientist 99.4(2011): 303. Opposing Viewpoints in Context. Web.4 Mar.2015.
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