Phantom Fireworks : Fireworks University : Pyrotechnic Compounds
Pyrotechnic Compounds
Pyrotechnic Compounds
Pyrotechnic Compounds
Colors in fireworks are usually generated by pyrotechnic stars—usually just called stars—which produce intense light when ignited. Stars contain five basic types of ingredients.
A fuel which allows the star to burn
An oxidizer—a compound which produces (usually) oxygen to support the combustion of the fuel
Color-producing chemicals
A binder which holds the pellet together.
A chlorine donor which provides chlorine to strengthen the color of the flame. Sometimes the oxidizer can serve this purpose.
Some of the more common color-producing compounds are tabulated here. The color of a compound in a firework will be the same as its color in a flame test (shown at right). Not all compounds that produce a colored flame are appropriate for coloring fireworks, however. Ideal colorants will produce a pure, intense color when present in moderate concentration.
Color
Li2CO3 (lithium carbonate) LiCl (lithium chloride)
Orange
CuCl2 (copper chloride), at low temperature
Indigo
Charcoa l , iron, or lampblack
White
Titanium, aluminum, beryllium, or magnesium powders
The brightest stars, often called Mag Stars, are fueled by aluminium. Magnesium is rarely used in the fireworks industry due to its lack of ability to form a protective oxide layer. Often an alloy of both metals called magnalium is used.
Many of the chemicals used in the manufacture of fireworks are non-toxic, while many more have some degree of toxicity, can cause skin sensitivity, or exist in dust form and are thereby inhalation hazards. Still others are poisons if directly ingested or inhaled.
Abstract reference of chemicals used in fireworks industry
The following table is an educational guideline for the chemistry of fireworks.
Symbol
Al
Aluminum
Aluminum is used to produce silver and white flames and sparks. It is a common component of sparklers.
Ba
Barium
Barium is used to create green colors in fireworks, and it can also help stabilize other volatile elements.
C
Carbon
Carbon is one of the main components of black powder, which is used as a propellent in fireworks. Carbon provides the fuel for a firework. Common forms include carbon black, sugar, or starch.
Ca
Calcium is used to deepen firework colors. Calcium salts produce orange fireworks.
Cl
Chlorine
Chlorine is an important component of many oxidizers in fireworks. Several of the metal salts that produce colors contain chlorine.
Cs
Cesium compounds help to oxidize firework mixtures. Cesium compounds produce an indigo color in fireworks.
Cu
Copper
Copper produces blue-green colors in fireworks and halides of copper are use to make shades of blue.
Fe
Iron
Iron is used to produce sparks. The heat of the metal determines the color of the sparks.
K
Potassium
Potassium compounds help to oxidize firework mixtures. Potassium nitrate, potassium chlorate, and potassium perchlorate are all important oxidizers. The potassium content can impart a violet-pink color to the sparks.
Li
Lithium
Lithium is a metal that is used to impart a red color to fireworks. Lithium carbonate, in particular, is a common colorant.
Mg
Magnesium
Magnesium burns a very bright white, so it is used to add white sparks or improve the overall brilliance of a firework.
Na
Sodium
Sodium imparts a yellow color to fireworks, however, the color is often so bright that it frequently masks other, less intense colors.
O
Oxygen
Fireworks include oxidizers, which are substances that produce oxygen in order for burning to occur. The oxidizers are usually nitrates, chlorates, or perchlorates. Sometimes the same substance is used to provide oxygen and color.
P
Phosphorus
Phosphorus burns spontaneously in air and is also responsible for some glow in the dark effects. It may be a component of a firework's fuel.
Rb
Rubidium compounds help to oxidize firework mixtures. Rubidium compounds produce a violet-red color in fireworks.
S
Sulfur
Sulfur is a component of black powder, and as such, it is found in a firework's propellant/fuel.
Sb
Antimony is used to create firework glitter effects.
Sr
Strontium
Strontium salts impart a red color to fireworks. Strontium compounds are also important for stabilizing fireworks mixtures.
Ti