The Magical Colors of Fireworks

The Magical Colors of Fireworks


An astonishing number of different cultures use fireworks in their celebrations of revolution, love and the passing of time. They may be used for many different types of celebrations within each culture, but the energy of color and sound carry a universal experience.

While, as you may all know, 12th century China first created fireworks to scare off evil spirits, but what you might not know is it was actually the Italians who first created the colors in fireworks.

The colors in fireworks are created by changing the 'color producing chemical' in the pyrotechnic star, which are pellets containing metal powders, salts or other compounds that, when ignited, burn a certain color. These pellets are then added to a 'lifting charge' made of gunpowder and provide the fuel to propel the shells into the air.

The Chemistry of Colors

There are two main mechanisms of color production in fireworks, incandescence and luminescence.

Red


strontium salts, lithium salts

Incandescence is light produced from heat. Heat causes a substance to become hot and glow, initially emitting infrared, then red, orange, yellow, and white light as it becomes increasingly hotter. When the temperature of a firework is controlled, the glow of components, such as charcoal, can be manipulated to be the desired color (temperature) at the proper time. Metals, such as aluminum, magnesium, and titanium, burn very brightly and are useful for increasing the temperature of the firework.

Orange


calcium salts

Luminescence is light produced using energy sources other than heat. Sometimes luminescence is called 'cold light', because it can occur at room temperature and cooler temperatures. To produce luminescence, energy is absorbed by an electron of an atom or molecule, causing it to become excited, but unstable. When the electron returns to a lower energy state the energy is released in the form of a photon (light). The energy of the photon determines its wavelength or color.

Pure colors require pure ingredients. Even trace amounts of sodium impurities (yellow-orange) are sufficient to overpower or alter other colors. Careful formulation is required so that too much smoke or residue doesn't mask the color. With fireworks, as with other things, cost often relates to quality. Skill of the manufacturer and date the firework was produced greatly affect the final display (or lack thereof).
- Chemistry of Firework Colors

Gold


incandescence of iron (with carbon), charcoal, or lampblack

Yellow


sodium compounds

History Of Firework Colors

Untill the 19th century, fireworks lacked a major aestheticly essential characteristic: color. Pyrotechnicians began to use a combination of potassium chlorate and various metallic salts to make brilliant colors. The salts of these metals produce the different colors: strontium burns red; copper makes blue; barium glows green; and sodium, yellow. Magnesium, aluminum, and titanium were found to give off white sparkles or a flash.
- History of Fireworks

White


white-hot metal, such as magnesium or aluminum

Green


barium compounds + chlorine producer

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.
- Pyrouniverse.com

Blue


copper compounds + chlorine producer

Purple


mixture of strontium (red) and copper (blue) compounds

Silver


burning aluminum, titanium, or magnesium powder or flakes

Photos from: tomvu, distortedsmile, cursedthing, aibakker, seansantry, wing-mui, gregw, anheuser, catcurl and aligraney

More Colorful Fireworks

fireworks_water.jpg
Photo by Mr Magoo ICU

colorful_fireworks1.jpg
Photo by Rafael Lopes - Dillbert

white_fireworks.jpg
Photo by toomanybeers

red_fireworks.jpg
Photo by sspyndel


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11 Comments
Showing 1 - 11 of 11 Comments

SparrowLP

great photos... and very interesting!

Dancing Fireworks

chelles~snail

I agree with SparrowLP, those photos are amazing!!!!

liddle_r

Very cool! Especially about the chemicals etc. I love fireworks!

untransformed

Another fireworks colour... :P

retsof

No, that's an Elmer Fudd element, Fwown....

retsof

or rather Fwownium....

mania

I love fireworks. We used it mostly in marriage ceremonies, festivals and in every happy occasions. Recently used it in kite festival.

Forensic

very nice pictures, nicest fireworks i've seen though there in picture

HartnSoul

I loved this information and the photos - I can't wait to show it to my 13 year old daughter, who is interested in the chemistry of fireworks & how they create each color! Cheers to 'evad' for posting this.

sspyndel

Well, I am certainly glad people liked my photo, however, it was used without my permission.

The saving grace, was that this was attributed to me, and I like the fact it is educational. Right up my alley.

So, I WILL let this one slide, but please, remember bloggers, it is polite to ASK FIRST.

I would have happily added a link under my photo to this, had they asked.

thanks,
Sspyndel

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