The Fireworks are part of our celebrations for centuries: they are in New Years Eve At Fallas, village fairs, weddings, concerts, and grand openings, few things draw as many eyes to the sky as a spectacular finale of colorful rockets, thunderous noise, and the smell of freshly burned gunpowder.
Behind that spectacle there is much more history, chemistry and symbolism From imperial China to American Independence Day, passing through French palaces and the beaches of Dubai, fireworks have served to celebrate victories, frighten spirits, demonstrate power… and have also generated debates about their impact on health, the environment and safety.
What exactly is a firework?
When we talk about fireworks, we are referring to pyrotechnic devices designed for aesthetic purposesFor entertainment or celebration. They are popularly also called fireworks, rockets, firecrackers or simply "fireworks", although technically each type has its own category.
Its effects are usually grouped into four main types of sensations: the noise (thunder, firecrackers, mascletàs), the lights (bursts of colors, flares, fountains), the smoke (columns, colored clouds, signals) and the floating or falling materials, such as the classic confetti that accompanies some shots.
Today they are used in cultural and religious celebrations From all over the world: New Year's, national holidays, patron saint festivals, weddings, parades, sporting events, concerts, or themed shows. In many places, they are, quite literally, the grand finale of the festivities.
China remains the great giant of production and export fireworks, but modern technology and safety regulations have been transforming the industry on virtually every continent.
From bamboo to rocket: the origins in China
The first chapter in the history of pyrotechnics is written in Ancient China, long before modern gunpowderDuring the Han dynasty (approx. 200 BC – 220 AD), villagers threw bamboo stalks into the fire; as the air inside the stalk heated up, the bamboo exploded with a loud bang, which was interpreted as a good system for warding off evil spirits.
Later, when gunpowder was discovered, it began to fill small containers with this explosive mixture to imitate and enhance those bursts of bamboo. These early firecrackers, halfway between magic and superstition, were known by names such as “baozhu” or “baogan”.
The big leap came in the Song Dynasty (960-1279), when they began to be manufactured firecrackers wrapped in paper with a wick: rolled paper tubes, filled with gunpowder, which could be chained together in long strips (the famous “bian” or “bianpao”) to achieve successive detonations very close to each other.
By the 11th and 12th centuries, Chinese documentation already mentions these. gunpowder firecrackers using specific termsThis demonstrates that it was not an improvised game but a rapidly evolving technology. Pyrotechnics began to blend into everyday life: in Song Dynasty markets, people could buy many types of fireworks for festive use.
They also organized grand exhibitions for the imperial courtIt is known, for example, that in 1110 a large-scale fireworks display was staged to entertain Emperor Huizong and his entourage. In 1264, there is even a record of the monumental fright of a dowager empress when a rocket-propelled firework exploded too close during a celebration in her honor.
Gunpowder: from “chemical fire” to bombs
Black powder, the soul of fireworks, was also discovered in China between the 8th and 9th centuriesLegend tells of alchemists who sought the elixir of eternal life and, by mixing sulfur, charcoal, and saltpeter (potassium nitrate), came up with a substance that instead of immortality offered explosions.
In Chinese it is known as “huo yao” or chemical fireIt's a fitting name for a mixture that burns extremely rapidly if sufficient oxygen is available. The Chinese were quick to exploit it not only for rituals and entertainment, but also as a weapon; it was combined with stones and metal fragments to make primitive bombs.
Classical military texts, such as the Huolongjing (Manual of the Fire Dragon) or the Wubeizhi, already collected detailed recipes for gunpowder with different proportions of saltpeter intended for both colored smoke signals and incendiary weapons, rockets and other war machines.
Towards the Middle Ages, this knowledge began to crossing borders into the Arab worldAround 1240, Syrian authors described rockets and fireworks, and referred to them with expressions such as "Chinese flowers," evidence that they recognized the oriental origin of the technology.
From colored smoke to the rainbow in the sky
The idea of coloring fire is not modern. It was already being experimented with in China. chemicals to dye the flames and smoke at least since the Han dynasty or shortly thereafter. Some treatises such as the Huolongjing or the Wubeizhi contain detailed recipes for producing signal smoke of different colors for military use.
In the 18th century, the author Zhao Xuemin compiled several formulas in his work Huoxilüe low nitrate powders combined with other compounds to obtain chromatic effects. They used, for example, arsenical sulfide for yellow, copper acetate (verdant) for green, lead carbonate for whitish-violet tones and mercurous chloride for white.
European travelers were fascinated by these color effects that were not yet mastered in EuropeWriters such as Antoine Caillot or the geographer Sir John Barrow pointed out that "the great secret" of Chinese pyrotechnics was precisely the variety and purity of the colors that managed to envelop the fire.
Later, in the 19th century, it was mainly the Italian pyrotechnicians who would perfect it the color palette of modern fireworks, adding very specific metallic salts for intense reds, bright greens, deep blues or golden yellows.
The expansion into Europe and the birth of modern entertainment
Gunpowder and pyrotechnics arrived in Europe via several routes, including the The Silk Road and the contacts between Italians, Arabs and ChineseMarco Polo is often cited as one of the introducers of fireworks towards the end of the 13th century, along with other exotic products from Asia.
By the 14th century, they were already being produced Fireworks in European territoryAlthough their use became more widespread, especially from the 17th century onwards, royal courts found them to be a perfect tool for displaying power and wealth at weddings, coronations, and major military victories.
In England, for example, the use of fireworks is documented in the wedding of Henry VII in 1486Later, Elizabeth I even had a servant dedicated exclusively to organizing gunpowder displays for palace events.
Italy became one of the major European centers of pyrotechnics, both in the military and festive spheres. Even in the Renaissance and the Modern Age, manuals such as the 16th-century Italian work "Pyrotechnics" were published, which included sections dedicated to how to manufacture rockets for attack and defense, but also for festivals and celebrations.
True modern fireworks, with the systematic use of metallic salts to intensify the color and finer lighting techniquesThey became established in Europe during the 1830s. From then on, pyrotechnics became professionalized and highly sought-after pyrotechnicians appeared, prized for their artistic skill.
Tradition, symbolism and politics: China, USA, France, Spain and Mexico
Besides the technical aspect, fireworks also carry a laden with cultural and political symbolismIn China, for centuries they have been associated with prosperity and warding off bad luck: they are protagonists of the Chinese New Year and the Mid-Autumn Festival, where huge displays fill the sky with light.
In the United States, fireworks became closely linked to the idea of freedom and national celebrationSince the signing of the Declaration of Independence in 1776, July 4th has been celebrated with fireworks in virtually every part of the country. One of the drafters, John Adams, even wrote to his wife predicting a future of "bonfires and illuminations" on every anniversary.
When George Washington was inaugurated as the first president in 1789, accounts tell us that The bells rang and the city was filled with fireworks. That night. Over time, Fourth of July celebrations became a hallmark of American identity.
Consequently, for much of the 19th century the French republic maintained a certain misgiving towards these expensive fires associated with the monarchyIt was not until 1880, when July 14th was officially declared a national holiday, that it was recommended to start celebrating it with "all the brilliance that resources allow," finally including the grand pyrotechnic illuminations.
In Spain, fireworks are deeply rooted in regions such as Valencia, Murcia or Alicantewhere it arrived through contacts with the Arab world and the rest of Europe. Mascletàs, chained firecrackers, and aerial shells have become an inseparable part of many local festivals.
On the other side of the Atlantic, Mexico He saw the fireworks. through the European conquerorswho brought gunpowder to the New World for both warfare and religious ceremonies. Over the centuries, Mexican festivals incorporated fireworks on a massive scale: castles, bull-shaped firecrackers, rockets, and popcorn are all part of the festive landscape. Today, South America and Mexico play a significant role in the manufacture and consumption of fireworks.
Sparklers and other handheld devices
Within the universe of fireworks, the Sparklers occupy a special placeThese are metal or wire sticks coated with pyrotechnic composition that, when lit, generate an intense shower of sparks for several seconds.
The exact history of modern commercial flares is not entirely clear, but it is known that Aluminum was first used around 1894 In decorative pyrotechnics, it's a key component for the intense white glow typical of sparklers. A few years earlier, in 1870, the businessman Octavius Hunt had set up a match factory in Bristol, and by 1936 he had bought a primitive sparkler formula from a German company, refining it to produce some of the most famous on the market.
Despite being associated with innocent image of children waving sparklers At Christmas or New Year's, sparklers reach temperatures of several thousand degrees, enough to melt metals like gold. It's no wonder that in countries like the UK, it's estimated that nearly half of all fireworks-related injuries are linked to their use.
Besides flares, other handheld fireworks are also part of the pyrotechnics. elements such as fire wheels, flyers, witches, wheelbarrows, masclets, shells, doves and popcornAll of them fall into the category of hot pyrotechnics, designed for use in open spaces, with flames, smoke and a considerable risk if not handled with experience.
In contrast to them, there is also the so-called cold pyrotechnicsDesigned for indoor or near-audience performances (concerts, theaters, stadiums), these fireworks use chemical compositions instead of large gunpowder charges. They produce sparks and effects with lower temperatures and shorter ranges, making them much more controllable and safer.
How colors and sparkles are created
The color in fireworks is obtained thanks to the pyrotechnic stars or “stars”Small, pressed pellets housed inside the casings. When ignited in the air, they emit a very intense light, creating patterns like fans, wreaths, palm trees, or sparkling showers.
These stars contain four basic components: a fuel, an oxidizer, a coloring salt, and a binder that holds everything together. The fuel can be coal, resins, sugars, or metallic powder; the oxidizer is usually a nitrate, chlorate, or perchlorate; and the metallic salt is responsible for the final color.
Each chemical element contributes a characteristic tone, similar to that shown in a laboratory flame testFor example, strontium salts (such as SrCO3 carbonate) provide a deep red; lithium gives a duller red; calcium produces oranges; sodium generates very bright yellows; barium provides greens; copper, blues; cesium and potassium, violets; and rubidium offers a reddish violet.
Gold and some warm tones are obtained mainly with coal, iron, or carbon blackwhich, when burned, produce yellow and gold sparks. For very bright whites, titanium, aluminum, or magnesium powders are used, although the latter is less common in commercial pyrotechnics because it does not form a protective oxide layer and is more reactive.
The typical sparks from certain flares and fountains are explained by the incandescence of solid particles (fragments of metal or hot coal) rather than discrete emissions from atoms in the vapor phase. It is basically blackbody radiation: the temperature of the particle determines whether we see it as reddish, yellow, or whitish.
In some cases, alloys such as the magnalium (magnesium + aluminum) to achieve extremely bright stars, known as Mag Stars in professional jargon. They are responsible for many of the most powerful flares we see in major light shows.
Most commonly used chemical elements in pyrotechnics
Behind every pyrotechnic effect there is a a very calculated combination of chemical elementsSome are used in the form of finely divided metal, others as salts. Among the most common are:
- Aluminum (Al): produces white or silver flames and sparks, very common in flares and high-brightness effects.
- Barium (Ba)Its salts are the basis of many intense greens and also help to stabilize mixtures with other components.
- Carbon (C): key component of black powder, acts as fuel (soot, sugar, starch…).
- Chlorine (Cl): present in chlorates and perchlorates, fundamental oxidants in many modern compositions.
- Copper (Cu): It is responsible for the blues when used in the form of suitable salts, such as copper(II) chloride.
- Iron (Fe)Iron powder for yellow and orange sparks in fountains and flares.
- Potassium (K)Potassium nitrate, potassium chlorate, and potassium perchlorate are classic oxidizers; potassium slightly tints sparks violet.
- Magnesium (Mg): blinding white metal, used to increase overall brightness.
- Sodium (Na)It produces very intense yellows, although it is often attempted to limit this because its brightness can "eat up" other more delicate colors.
- Oxygen (O): present in oxidizers; without it there is no rapid combustion or controlled explosion.
- Sulfur (S): another of the traditional components of black powder, it facilitates ignition.
- Strontium (Sr): key to bright reds.
- Titanium (Ti) and zirconium (Zr)They burn forming very bright oxides, ideal for cascades of sparks and intense silver effects.
Many of these substances are relatively low toxicity at the doses usedHowever, others can be dangerous through inhalation, prolonged skin contact, or accidental ingestion, especially in the form of fine powder during manufacturing.
Historical curiosities and pyrotechnic records
The history of fireworks is full of curious anecdotes and striking episodesSome commonly discussed examples are:
In the 17th and 18th centuries, fireworks were considered a exclusive luxury of royalty and high nobilityIt was not until the 1730s and 1740s that they also began to be used to celebrate political and military achievements of independence movements, as happened in the British colonies of North America.
In the scientific field, books such as “Mysteries of Nature and Art” (1635), by John BateThey explained how to create fire-breathing dragons and other spectacular artifacts. It is said that works of this kind sparked the interest of young men like Isaac Newton in physics and chemistry.
With the arrival of the 20th century, popular culture embraced pyrotechnics. It is said, for example, that Keith Moon, the drummer for The Who, became fond of using them. cherry bomb type firecrackers (shaped like a cherry) —originally used in military contexts— to play explosive pranks, which ended up contributing to the banning of these devices due to their enormous power.
At the end of the 20th and beginning of the 21st centuries, large entertainment corporations gave the sector a new boost. Disney became one of the largest consumers of fireworks in the United States, and even tested compressed air launch systems at places like Epcot to reduce the use of gunpowder.
Among the most talked-about records, the following stands out: Dubai show of January 1, 2014, considered one of the largest pyrotechnic displays ever made: some 450.000 fireworks launched in a gigantic show in front of the sea to welcome the new year.
Noises, “silent fires” and animals
Sound is an essential part of many fireworks, but it is also the cause of a long list of criticisms and concernsThe sudden loud noise can be traumatic for Petswildlife and people with noise sensitivity, post-traumatic stress disorder or similar conditions.
In recent years, the so-called “silent pyrotechnic displays”These are not completely silent fireworks displays—that is impossible nowadays—but rather shows that exclude the most powerful and noisy pieces (large thunderclaps, large mortars) and opt for more visual and less explosive displays.
An often cited example is that of the Italian city of Collecchiowhich in 2015 decided to switch to low-noise fireworks to reduce the impact on animals and vulnerable people. More and more municipalities are studying similar approaches.
Even so, even “silent” shows generate a certain level of noise from combustion and launchingTherefore, the debate about how compatible they are with animal welfare remains open in many countries.
Health and environmental risks
Beyond the obvious burns and injuries, fireworks pose less visible but important problems for health and the environment. When they explode, they release smoke, dust, and Solid waste that may contain heavy metals and potentially toxic chemical compounds.
For most of the population, the effects of a sporadic exposure and low doses They are considered unclear, but in people with asthma, respiratory allergies or multiple chemical sensitivity, the smoke from a firework display can trigger or aggravate respiratory crises.
One of the compounds that is of greatest concern is the perchlorateIt is used as an oxidizing agent in numerous modern mixtures. In its solid state, it can dissolve easily in surface and groundwater, and even at very low concentrations, it can interfere with the absorption of iodine by the thyroid gland.
In countries like the United States, the Environmental Protection Agency has studied the problem and some states—such as Massachusetts or California—have adopted Specific regulations on perchlorate in drinking water and regarding its management in the industry. California, for example, passed a law to prevent perchlorate pollution and established mandatory best practices for companies that handle it.
The courts have also ruled: in 2003, a federal district court in California considered perchlorate as “characteristic” hazardous waste under the CERCLA Act, being flammable, which opened the door to demanding accountability for its release into the environment.
Another cause for concern is the solid waste left by mass consumption fires: cardboard scraps, plastic, metal rods, wrappers, etc. Although some of the material is biodegradable, other components persist for a long time if not collected. This combination of waste, consumer safety, and pollution has led some countries to significantly restrict the over-the-counter sale of fireworks, leaving large-scale displays in the hands of professionals.
On the other hand, some argue that the The pollution attributable to fireworks is minuscule. compared to that generated by burning fossil fuels or heavy industry. In the United States, certain limitations on the use of fires on specific days fall under the Clean Air Act, which allows for the regulation of activities that may worsen air quality at specific times.
In response, part of the pyrotechnics industry has announced initiatives to reduce or phase out perchlorate in their products, replacing it with other, less problematic oxidants. Although these developments are underway, their global implementation is still uneven.
Safety: Why it's not child's play
Improper handling of fireworks can cause severe burns, eye injuries, amputations, and other accidents both the person lighting them and those nearby. Data from countries like the United Kingdom are clear: a very high percentage of accidents are associated with seemingly innocent products like flares.
Clothing also plays a role. Synthetic garments can accumulate enough static electricity to accidentally turn on Some fireworks are sensitive. Therefore, it is advised that people handling fireworks wear cotton clothing, avoid storing firecrackers in pockets or bags, and refrain from touching the fuses unnecessarily.
At the regulatory level, it wasn't until 1976 that they were implemented in some countries. mandatory basic security protocolssuch as requiring that wicks have a minimum burn time of 3 seconds and a maximum of 9 seconds, and that products include clear warning labels about their use.
Today, there is an emphasis on the fact that fireworks must be placed in the hands of certified professionals When it comes to medium or large setups, only low-risk categories are reserved for the end consumer, and instructions are always followed to the letter. Even so, overly confident use at home is still common at many parties.
In parallel, they have proliferated schools and specialized pyrotechnics courses In countries like Italy or Germany, future pyrotechnicians are trained in chemistry, safety, legislation and show design, which has helped to further professionalize the sector.
In any case, the underlying message is clear: however spectacular the fireworks may be, They are not simple toys, nor do they involve risky snacks.They require respect, distance, protection and, whenever possible, the intervention of experts.
After more than two thousand years of evolution, from that bamboo exploding in a Chinese bonfire to the massive shows synchronized with music and computers, fireworks remain a fascinating mix of science, art, tradition, and danger; its history, its chemistry, its symbolism, and its risks It helps you enjoy them with different eyes and, above all, with much more responsibility.
