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How do Chemicals Make Fireworks Colourful?

One of the reasons fireworks are such magnificent things is the colours. There is just something quite extraordinary in a black night sky and bursts of purple, white, red and blue. What’s the secret behind the colours in fireworks?

It’s all in the chemistry

The answer is, of course, chemistry. Each firework contains a mixture of chemicals that not only cause the explosions and effects but also affect the colours you see. Figuring out the right combinations can be tricky and the fireworks you buy from our store are the result of experiments with different mixtures to produce high-quality, beautiful fireworks.
Now, each firework has an aerial shell that contains these chemicals. The aerial shell is essentially a tube, which contains the gunpowder and small modules known as stars. These stars are small – around 1 to 1.5 inches in diameter – but they provide a mixture of ingredients to create the effects and colours. The stars contain four ingredients:

  • The fuel
  • An oxidising agent
  • A binder
  • Metal salts or metal oxides

It’s about the release of energy

colours
 
When you light up the firework, it will explode and release the stars in different directions. When the firework explodes, the ingredients in the stars are exposed to fire. This heats these elements, with the fuel and the oxidising agents speeding up the process.
This rapid release of heat will, in turn, activate the metal containing salts and oxides and create the different hues. The metal compounds absorb energy when they are heated and this causes the electrons in the material to rearrange. The rearrangement happens by moving the electrons from the lowest energy state to a higher state. Once the electrons start plummeting back down to the lower state, the excess energy is released as light.
The reason you see different colours is down to chemical elements containing different amounts of energy. With different energy, the light will emit in a different wavelength and this will determine which colour you see.
There are two mechanisms at work when the chemicals heat. The first is incandescence, which is light produced from heat. This just means that when the chemicals are hot they start glowing and emitting light. The second mechanism is luminescence, which means the light comes from the energy and not the heat itself.

Chemicals for different firework colours

So what kind of different chemicals do you need to produce the colours? Here are the chemical compositions of some of the best firework colours:

  • Red – strontium salts, lithium salts
  • Gold – incandescence of iron, charcoal, or lampblack
  • Yellow – sodium compounds
  • Green – barium compounds, chlorine producer
  • Blue – copper compounds, chlorine producer
  • Purple – mixture of strontium and copper compounds
  • Silver – burning aluminium, titanium or magnesium powder

 
Fireworks are wonderful things and the colours definitely add to the appeal. They also allow you to be playful with the fireworks – choosing red for Christmas or green for St Patrick’s Day. Next time you light up fireworks pause for a moment to marvel at the chemistry behind what you see.

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Delivery Information

Next Day

 – You will receive your order the following working day from day of despatch (not including Saturday/Sunday). We endeavour to dispatch all orders placed before 12pm the same day although this is not always possible in our busy season, October – December. If you require your order by a certain date enter this in the “order notes” section on the next page. All dates are treated as the latest date for delivery NOT the date you would like delivery.


Hold For Later Delivery

– This option is for those who would like us to hold on to their order and deliver it nearer to the date of their display. You should enter this date in the “order notes” section on the next page.


Collect from Chelmsford Store

– Select this option if you would like to collect your order. Enter the date you would like to collect and AM/PM in the “order notes” section on the next page. Collection is not available on SATURDAY 2nd NOVEMBER 2019. You will be required to bring the card you used to pay with and photo ID before you can collect your order. THESE MUST MATCH.


Add to Existing Order

 – If you already have an order with us and would like to add to it before it is shipped, select this option then enter your existing order number in the “order notes” section on the next page.


Saturday Delivery

 – Enter the date you would like your order delivered in the “order notes” section on the next page. If this is blank your order will be delivered on the next Saturday after the day of ordering. PLEASE NOTE it is not possible to deliver orders on the Saturday either side of Bonfire Night, Christmas or New Year


AM DELIVERY

 – Your order will be delivered before midday the day after it has been dispatched (excluding Saturday / Sunday)


Before 10:30 am

 – Your order will be delivered before 10:30am the day after it has been dispatched (excluding Saturday / Sunday).