Why Does Each Candle Have a Different Colour?

Not all metals behave the same way.

Every type of metal has its own unique arrangement of atoms. When those atoms are heated, they release different colours of light.

Some common examples include:

• 🔴 Strontium – red flames

• 🟢 Barium – green flames

• 🟡 Sodium – yellow or orange flames

• 🔵 Copper – blue-green flames

• 🟣 Potassium – lilac or purple flames

Even a tiny amount of these metals can completely change the colour of a flame.

Tiny Candles... Giant Fireworks!

The science inside your birthday candle is the same science used in giant fireworks.

Firework designers carefully choose different metal compounds to create brilliant red, green, blue and purple explosions across the night sky.

The next time you watch fireworks, see if you can spot the different colours and imagine the tiny metal atoms creating each spectacular display.

Where Do Scientists Use This?

Flame colours aren't just beautiful—they're useful.

Scientists use coloured flames to:

• Identify some chemicals in laboratories

• create colourful fireworks

• study the light coming from distant stars

By looking carefully at the colours, scientists can learn surprising things about the materials they are investigating.

Think Like a Scientist

During this investigation, you didn't simply watch a candle burn.

You:

• made a prediction

• observed carefully

• looked for patterns

• collected evidence

• compared different candles

• used your observations to explain what happened

That's exactly how scientists solve mysteries every day!

Keep Exploring

If you enjoyed this experiment, you might also like these chemistry investigations:

Coloured Rain – Discover why food colouring suddenly falls through oil like colourful rain.

Grow Amazing Crystals – Watch dissolved minerals build beautiful crystal shapes.

Dragon Snot Slime – Explore fascinating polymers and unusual slimy materials.

Rainbow Milk – Discover how soap can make colours race across milk.

You can also explore hundreds of connected science articles, experiments and curious questions inside The Crazy Scientist Learning Universe, where every experiment links to real-world science, amazing discoveries and new investigations waiting to be explored.

Curious Question

If scientists can identify different metals by the colours they produce, could they work out what distant stars are made of just by studying their light?

Explore more science mysteries inside The Crazy Scientist Learning Universe and see where your curiosity takes you!