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For centuries, fireworks have been used to mark major events around the world: the births of nations, weddings, birthdays, funerals and New Year's celebrations.
In China, the tradition of lighting fireworks to ward off evil spirits has been passed down through the generations. In the US, meanwhile, fireworks are synonymous with the country's 4th of July celebrations. Elsewhere, Hindus use them to celebrate Diwali, while in Russia and across Europe, large displays have traditionally marked the end of wars.

But before fireworks can take over the skies, each one must be carefully and meticulously crafted. The process -- which can take days to complete -- is an art in its own right, according to Wu Hongyong, director of production and technology at one of China's biggest firework companies.
His firm, Jiangxi Zhongsen Fireworks Ltd, ships over 30,000 boxes of pyrotechnics around the world each year, with each of the fireworks made by hand.
"We see it as an art to make everyone in the world happy," Wu said.

Made in China
Having first invented gunpowder over 2,000 years ago, China now produces more fireworks than anywhere else in the world. The country is responsible for over 90% of America's Independence Day fireworks, exporting $307.8 million worth to the US for its July 4th celebrations in 2016 (the US produced just $10 million worth for the holiday that year).

"It is a complicated and messy process," Wu said. "From purchasing materials to the production... it is time consuming."
Each firework contains small balls of explosives, known as stars, that are responsible for the colorful light displays seen in the sky. They are mixed with gunpowder in a shell, and then wrapped in paper and fitted with a fuse. Stars can be wrapped and pressed into different designs, meaning that buyers can request particular shapes to commemorate important occasions.
Wilson Mao, the CEO of Hong Kong-based Pyromagic, requested a firework shaped like an "8" to mark the Lunar New Year. For decades, Pyromagic Multi-media Productions has been responsible for Hong Kong's firework displays. "If you're superstitious, in Chinese culture 8He's got a bit of a flat back-swing, but that might be deliberate. History is littered with players who had slightly 'off' back-swings, but they managed to re-route it and get the club in a good place coming down.

Source: cnn