Fireworks are probably the most identifiable event for Fourth of July. Fireworks have been associated with Fourth of July since 1777. Firework shows are held in many states and families and groups even buy them for private use. Fireworks are often accompanied by singing or music of patriotic songs.
The history of fireworks goes back thousands of years to China during the Han dynasty (~200 B.C.), even long before gunpowder was invented. It is believed that the first "firecrackers" were likely chunks of green bamboo, which someone may have thrown onto a fire when dry fuel ran short. The rods sizzled and blackened, and after a while, unexpectedly exploded. Bamboo grows so fast that pockets of air and sap get trapped inside of the plant's segments. When heated, the air inside of the hollow reeds expands, and eventually bursts through the side with a long bam!
The strange sound, which had never been heard before, frightened people and animals terribly. The Chinese figured that if it scared living creatures so much, it would probably scare away spirits - particularly an evil spirit called Nian, who they believed to eat crops and people. After that, it became customary for them to throw green bamboo onto a fire during the Lunar New Year in order to scare Nian and other spirits far way, thus ensuring happiness and prosperity to their people for the remainder of the year. Soon, the Chinese were using bursting bamboo for other special occasions, such as weddings, coronations, and births. The "bursting bamboo", or pao chuk as the Chinese called it, continued to be used for the next thousand or so years.
Although now we don’t use the explosives to scare off spirits but to celebrate our spirit! We did not get the idea from the Chinese but the Italians. the Italians had been fascinated with fireworks ever since the explorer Marco Polo brought back firecrackers from the Orient in 1292. During the Renaissance in Europe (1400-1500), the Italians began to develop fireworks into a true art form. Since this was a period of artistic creativity and expression, many new fireworks were created for the first time. Military rockets could be modified by adding powered metals and charcoal in order to create bursts of gold and silver sparks in the sky.
The Italians were able to develop aerial shells - canisters of of explosive composition that were launched into the sky and exploded at the maximum altitude (the Chinese also developed shells that were spherical in shape). However, the most spectacular firework displays were still those made at ground level. Firework makers discovered how a special slower-burning gunpowder mix could be put in an open-ended tube, which would give off sparks when lit. The dense showers of bright sparks resembled water spewing from a fountain, so the new pyrotechnic device was named accordingly. If rocket engines were attached to a wooden wheel framework, it would spin around rapidly and give off sparks in a circular pattern. Sculptors would carve giant, detailed models of castles or palaces, which would be adorned with fountains, wheels, and torches. These "temples", as they were called, were a beautiful and crowd-pleasing sight when ignited. Such displays became in high demand throughout Europe. The idea of controlled fire was fascinating to all, and kings saw no better way to show their wealth and power then by having fireworks at their religious festivals, weddings, and coronation ceremonies.
These firework displays grew more and more elaborate over the years, employing the work of carpenters, metalworkers, masons, and painters to help construct the temples. Firemasters learned that the effects of fireworks could be greatly enhanced by setting them on small floats in water, where more light and noise would be reflected back towards the audience. Starting in the early 1530s, fireworks would usually be ignited by "green men", a term given to firemasters who covered their faces in soot and dressed in leaves in order to both protect themselves from sparks and be hard to see as they ran around lighting fuses. From 1500-1700, the most popular type of firework was the "dragon". The massive device consisted of a wooden framework which was covered in painted paper-maché scales. Inside, it was loaded with fountains, firecrackers, and rockets, some of which would shoot out of the mouth to make it "breathe fire". Often times, two or more dragons would be constructed and aimed at each other as they ignited to "battle".
Around the 1730s, firework shows in England became huge public displays rather than just the private entertainment of royalty. People from all over Europe would come to witness the spectacular fireworks displays at amusement parks in Britain. The discovery of "quick match" - a fast-burning fuse made by putting regular fuse into a small, continuous paper tube - gave firemasters the ability to ignite many fireworks simultaneously, and enabled the construction of set pieces. Set pieces are giant pictures/words made from hundreds of small burning torches, which were often created in the likeness of popular figures such as royalty.
Settlers brought fireworks over to the Americas around the 1600s, where they continued to be used to celebrate special occasions and to impress or scare off Native Americans. The very first 4th of July celebration was in 1777, only one year after the signing of the Declaration of Independence. The United States was still in the midst of the Revolutionary War and the outcome was still uncertain, but beautiful displays of fireworks instilled a sense of hope and patriotism in the citizens of the young nation. When trade relations were established between the U.S. and China less than a century later, Chinese firecrackers became a major import in America.
For nearly 1000 years, the only colors that could be produced by fireworks was the orange flash/sparks from black powder, and white sparks from metal powders. But in southern Italy in the 1830s, scientific advancements in the field of chemistry enabled pyrotechnicians (the modern term for the old "fire masters") to create reds, greens, blues, and yellows by adding both a metallic salt (strontium=red, barium=green, copper=blue, sodium=yellow) and a chlorinated powder to the firework composition. Potassium chlorate (KClO3), a new oxidizer that burned faster and hotter than potassium nitrate, allowed pyrotechnicians to make the new colors deeper and brighter. The harnessing of electrical energy made it possible to obtain pure magnesium and aluminum by electrolysis, which also made fireworks burn brighter. When fine aluminum powder was mixed proportionally with an oxidizer, the resulting mixture - flash powder - burned much hotter and faster than black powder, allowing for the manufacture of louder firecrackers and salutes in aerial fireworks.
