Ingredients/Colours
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Aluminum - Aluminum is used to produce silver and flames and sparks. used in sparklers.
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Antimony - Antimony is used to create firework glittery effects.
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Barium - Barium is used to create green colors in fireworks.
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Calcium - Calcium is used to strenghten firework colors, and orange colours.
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Carbon - Carbon is one of the main components of black powder, which is used lift the firworks. Carbon is the fuel for a firework.
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Chlorine - Chlorine is a component of oxidizers in fireworks. allows the fule to burn easly.
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Copper - Copper creates blue colors in fireworks.
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Iron - Iron is used to produce sparks. The heat of the metal changes the color of the sparks.
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Lithium - Lithium is a metal that is used to make a red color to fireworks.
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Magnesium - Magnesium burns a very bright white. it is used to add white sparks.
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Oxygen - Fireworks include oxidizers, which are substances that make oxygen. wich helps the fule to burn.
Source - http://chemistry.about.com/od/fireworkspyrotechnics/a/fireworkelement.htm


Oxidisers
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The function of the oxidiser is to produce the oxygen needed for the explosives inside the firework to burn/combust. These oxidisers can be things called nitrates, chlorates or perchlorates.
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Without Oxidisers fireworks would be very boring as the fireworks would not explode, they would just go up and come streight back down.
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Oxidisers are very dangerouse though becouse they make fireworks highly flamable and can make nearby gasses and combustable liquids/solids more flamable aswell.
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They are also very dangerouse becouse they Lower the ignition temperature of anything combustable.
Source - http://www.ch.ic.ac.uk/local/projects/gondhia/composition.html